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general description the max7323 2-wire serial-interfaced peripheral features eight i/o ports. four ports are push-pull outputs and the other four are open-drain i/o ports that are overvoltage protected up to +6v independent of the supply voltage. the four i/o ports configured as inputs are continu- ously monitored for state changes (transition detec- tion). state changes are indicated by the open-drain int output. the interrupt is latched, allowing detection of transient changes. when the max7323 is subse- quently accessed through the serial interface, any pending interrupt is cleared. the four push-pull and four open-drain outputs are rated to sink 20ma and are capable of driving leds. the rst input clears the serial interface, terminating any i 2 c communication to or from the max7323. the max7323 uses two address inputs with four-level logic to allow 16 i 2 c slave addresses. the slave address also determines the power-up logic state for the i/o ports, and enables or disables internal 40k pullups for the input ports in groups of two ports. the max7323 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain i/o ports, and push-pull output ports (see table 1). the max7323 is available in 16-pin qsop and 16-pin tqfn packages, and is specified over the automotive temperature range (-40? to +125?). features ? 400khz i 2 c serial interface ? +1.71v to +5.5v operating voltage ? 4 push-pull output ports rated at 20ma sink current ? 4 open-drain i/o ports rated to 20ma sink current ? 4 i/o ports are overvoltage protected to +6v ? transient changes are latched, allowing detection between read operations ? int output alerts change on inputs ? ad0 and ad2 inputs select from 16 slave addresses ? low 0.6 a (typ) standby current ? -40? to +125? operating temperature range max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os ________________________________________________________________ maxim integrated products 1 19-3806; rev 1; 7/07 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information part temp range pin- package top mark pkg code max7323aee+ -40? to +125? 16 qsop e16-4 max7323ate+ -40? to +125? 16 tqfn-ep* 3mm x 3mm ade t1633-4 pin configurations and functional diagram appear at end of data sheet. selector guide part inputs interrupt mask open- drain outputs push-pull outputs max7319 8 yes max7320 8 max7321 up to 8 up to 8 max7322 4 yes 4 max7323 up to 4 up to 4 4 max7328 up to 8 up to 8 max7329 up to 8 up to 8 + denotes a lead-free package. * ep = exposed paddle. cell phones san/nas servers notebooks raid automotive applications max7323 p2 o7 o6 p5 p4 v+ 0.047 f c scl sda scl ad0 o1 o0 sda p3 ad2 int output output rst int rst i/o i/o i/o i/o output output 3.3v gnd typical application circuit
max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd.) supply voltage v+....................................................-0.3v to +6v scl, sda, ad0, ad2, rst , int , p2?5 ...................-0.3v to +6v o0, o1, o6, o7...............................................-0.3 to (v+ + 0.3v) o0, o1, o6, o7 output current........................................?5ma p2?5 sink current...........................................................?5ma sda sink current ............................................................... 10ma int sink current..................................................................10ma total v+ current..................................................................50ma total gnd current ...........................................................100ma continuous power dissipation (t a = +70?) 16-pin qsop (derate 8.3mw/? above +70?)...........667mw 16-pin tqfn (derate 15.6mw/? above +70?) .......1250mw operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics (v+ = +1.71v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at v+ = +3.3v, t a = +25?.) (note 1) parameter symbol conditions min typ max units operating supply voltage v+ 1.71 5.50 v power-on reset voltage v por v+ falling 1.6 v standby current (interface idle) i stb scl and sda and other digital inputs at v+ 0.6 1.5 ? supply current (interface running) i+ f scl = 400khz; other digital inputs at v+ 23 55 ? v+ 1.8v 0.8 x v+ input high voltage sda, scl, ad0, ad2, rst , p2?5 v ih v+ 1.8 0.7 x v+ v v+ 1.8v 0.2 x v+ input low voltage sda, scl, ad0, ad2, rst , p2?5 v il v+ 1.8v 0.3 x v+ v input leakage current sda, scl, ad0, ad2, rst , p2?5 i ih , i il sda, scl, ad0, ad2, rst , p2?5 at v+ or gnd, internal pullup disabled -0.2 +0.2 a input capacitance sda, scl, ad0, ad2, rst , p2?5 10 pf v+ = +1.71v, i sink = 5ma 105 180 v+ = +2.5v, i sink = 10ma 131 240 v+ = +3.3v, i sink = 15ma 154 290 output low voltage o0, o1, o6, o7, p2?5 v ol v+ = +5v, i sink = 20ma 160 310 mv v+ = +1.71v, i source = 2ma v+ - 250 v + - 30 v+ = +2.5v, i source = 5ma v+ - 360 v + - 70 v+ = +3.3v, i source = 5ma v+ - 260 v + - 100 output high voltage o0, o1, o6, o7 v oh v+ = +5v, i source = 10ma v+ - 350 v + - 120 mv output low voltage sda v olsda i sink = 6ma 250 mv output low voltage int v olint i sink = 5ma 130 250 mv port input pullup resistor r pu 25 40 55 k
max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os _______________________________________________________________________________________ 3 port and interrupt int timing characteristics (v+ = +1.71v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at v+ = +3.3v, t a = +25?.) (note 1) parameter symbol conditions min typ max units port output data valid t ppv c l 100pf 4 s port input setup time t psu c l 100pf 0 s port input hold time t ph c l 100pf 4 s int input data valid time t iv c l 100pf 4 s int reset delay time from stop t ip c l 100pf 4 s int reset delay time from acknowledge t ir c l 100pf 4 s timing characteristics (v+ = +1.71v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at v+ = +3.3v, t a = +25?.) (note 1) parameter symbol conditions min typ max units serial-clock frequency f scl 400 khz bus free time between a stop and a start condition t buf 1.3 ? hold time (repeated) start condition t hd , sta 0.6 ? repeated start condition setup time t su , sta 0.6 ? stop condition setup time t su , sto 0.6 ? data hold time t hd , dat (note 2) 0.9 ? data setup time t su , dat 100 ns scl clock low period t low 1.3 ? scl clock high period t high 0.7 ? rise time of both sda and scl signals, receiving t r (notes 3, 4) 20 + 0.1c b 300 ns fall time of both sda and scl signals, receiving t f (notes 3, 4) 20 + 0.1c b 300 ns fall time of sda, transmitting t f,tx (notes 3, 4) 20 + 0.1c b 250 ns pulse width of spike suppressed t sp (note 5) 50 ns capacitive load for each bus line c b (note 3) 400 pf rst pulse width t w 500 ns rst rising to start condition setup time t rst 1s note 1: all parameters tested at t a = +25?. specifications over temperature are guaranteed by design. note 2: a master device must provide a hold time of at least 300ns for the sda signal (referred to v il of the scl signal) in order to bridge the undefined region of scl? falling edge. note 3: guaranteed by design. note 4: c b = total capacitance of one bus line in pf. t r and t f measured between 0.3 x v+ and 0.7 x v+ with i sink 6ma. note 5: input filters on the sda and scl inputs suppress noise spikes less than 50ns.
max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 4 _______________________________________________________________________________________ typical operating characteristics (t a = +25?, unless otherwise noted.) 0 0.4 0.2 1.0 0.8 0.6 1.2 1.4 1.8 1.6 2.0 -40 -10 5 -25 203550658095110125 standby current vs. temperature max7323 toc01 temperature ( c) standby current ( a) v+ = +3.3v v+ = +2.5v v+ = +5.0v v+ = +1.71v f scl = 0khz 0 20 10 40 30 50 60 -40 -10 5 20 -25 35 50 65 80 95 110 125 supply current vs. temperature max7323 toc02 temperature ( c) supply current ( a) v+ = +3.3v v+ = +5.0v v+ = +1.71v v+ = +2.5v f scl = 400khz output voltage low vs. temperature temperature ( c) output voltage low (v) max7323 toc03 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 v+ = +5.0v i sink = 20ma v+ = +2.5v i sink = 10ma v+ = +1.71v i sink = 5ma v+ = +3.3v i sink = 15ma output voltage high vs. temperature temperature ( c) output voltage high (v) max7323 toc04 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 1 2 3 4 5 6 v+ = +3.3v i source = 15ma v+ = +5.0v i source = 20ma v+ = +2.5v i source = 5ma v+ = +1.71v i source = 2ma pin description pin qsop tqfn name function 1, 3 15, 1 ad0, ad2 address inputs. select device slave address with ad0 and ad2. connect ad0 and ad2 to either gnd, v+, scl, or sda to give four logic combinations (see table 3). 216 rst reset input, active low. drive rst low to clear the 2-wire interface. 4, 5, 11, 12 2, 3, 9, 10 o0, o1, o6, o7 output ports. o0, o1, o6, and o7 are push-pull outputs. 6, 7, 9, 10 4, 5, 7, 8 p2?5 i/o ports. p2 to p5 are open-drain i/os rated to +6v, 20ma. 8 6 gnd ground 13 11 int interrupt output. int is an open-drain output. 14 12 scl i 2 c-compatible serial clock input 15 13 sda i 2 c-compatible serial data i/o 16 14 v+ positive supply voltage. bypass v+ to gnd with a ceramic capacitor of at least 0.047? as close to the device as possible. ep ep exposed pad. connect exposed pad to gnd.
detailed description max7319?ax7329 family comparison the max7319?ax7323 family consists of five pin- compatible, eight-port expanders. each version is opti- mized for different applications. the max7328 and max7329 are industry-standard parts. the max7324?ax7327 family consists of four pin- compatible, 16-port expanders that integrate the func- tions of the max7320 and one of either the max7319, max7321, max7322, or max7323. functional overview the max7323 is a general-purpose port expander, oper- ating from a +1.71v to +5.5v supply, that provides four push-pull output ports with 20ma sink, 10ma source drive capability, and four open-drain i/o ports with a 20ma sink capability. the four open-drain outputs are overvoltage protected to +6v independent of supply voltage. the max7323 is set to one of 16 i 2 c slave addresses (0x60 to 0x6f) using the address select inputs ad0 and ad2, and is accessed over an i 2 c serial interface up to 400khz. the rst input clears the serial interface in case of a bus lockup, terminating any serial transaction to or from the max7323. max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os _______________________________________________________________________________________ 5 part i 2 c slave address inputs input interrupt mask open- drain outputs push- pull outputs application 8-port expanders max7319 110xxxx 8 yes input-only versions: 8 input ports with programmable latching transition detection interrupt and selectable pullups. offers maximum versatility for automatic input monitoring. an interrupt mask selects which inputs cause an interrupt on transitions, and transition flags identify which inputs have changed (even momentarily) since the ports were last read. max7320 101xxxx 8 output-only versions: 8 push-pull outputs with selectable power-up default levels. push-pull outputs offer faster rise time than open- drain outputs, and require no pullup resistors. max7321 110xxxx up to 8 up to 8 i/o versions: 8 open-drain i/o ports with latching transition detection interrupt and selectable pullups. open-drain outputs can level shift the logic-high state to a higher or lower voltage than v+ using external pullup resistors. any port can be used as an input by setting the open-drain output to logic-high. transition flags identify which inputs have changed (even momentarily) since the ports were last read. max7322 110xxxx 4 yes 4 4 input-only, 4 output-only versions: 4 input ports with programmable latching transition detection interrupt and selectable pullups; 4 push-pull outputs with selectable power-up default levels. table 1. max7319?ax7329 family comparison
max7323 any of the four open-drain ports can be configured as a logic input by setting the port output logic-high (logic- high for an open-drain output is high impedance). when the max7323 is read through the serial interface, the actual logic levels at the ports are read back. the four ports offer latching transition detection func- tionality. all input ports are continuously monitored for changes. an input change sets 1 of 4 flag bits that identify changed input(s). all flags are cleared upon a subsequent read or write transaction to the max7323. a latching interrupt output, int, automatically flags data changes on any of the i/o ports used as inputs. the interrupt output int , and all transition flags are deasserted when the max7323 is next accessed through the serial interface. internal pullup resistors to v+ are selected by the address select inputs, ad0 and ad2. pullups are enabled on the input ports in groups of two (see table 3). use the slave address selection to ensure that i/o ports used as inputs are logic-high on power-up. i/o ports with internal pullups enabled default to a logic-high output state. i/o ports with internal pullups disabled default to a logic-low output state. output port power-up logic states are selected by the address select inputs ad0 and ad2. ports default to logic-high or logic-low on power-up in groups of two (see table 3). initial power-up on power-up, the transition detection logic is reset, and int is deasserted. the interrupt mask register is set to 0x3c, enabling the interrupt output for transitions on all four input ports. the transition flags are cleared to indi- cate no data changes. the power-up default state of the four push-pull outputs is set according to the i 2 c slave address selection inputs, ad0 and ad2 (see table 3). power-on reset the max7323 contains an integral power-on-reset (por) circuit that ensures all registers are reset to a known state on power-up. when v+ rises above v por (1.6v max), the por circuit releases the registers and 2-wire interface for normal operation. when v+ drops to less than v por , the max7323 resets all ports to the por defaults (see table 3). rst input the active-low rst input operates as a reset that voids any current i 2 c transaction involving the max7323, forcing the max7323 into the i 2 c stop condition. the reset action does not clear the interrupt output ( int ). standby mode when the serial interface is idle, the max7323 automati- cally enters standby mode, drawing minimal supply current. i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 6 _______________________________________________________________________________________ part i 2 c slave address inputs input interrupt mask open- drain outputs push- pull outputs application max7323 110xxxx up to 4 up to 4 4 4 i/o, 4 output-only versions: 4 open-drain i/o ports with latching transition detection interrupt and selectable pullups. 4 push-pull outputs with selectable power-up default levels. max7328 max7329 0100xxx 0111xxx up to 8 up to 8 8 open-drain i/o ports with nonlatching transition detection interrupt and pullups on all ports. all ports power up as inputs (or logic-high outputs). any port can be used as an input by setting the open-drain output to logic-high. 16-port expanders max7324 8 yes 8 software equivalent to a max7320 plus a max7319. max7325 up to 8 up to 8 8 software equivalent to a max7320 plus a max7321. max7326 4 yes 12 software equivalent to a max7320 plus a max7322. max7327 101xxxx and 110xxxx up to 4 up to 4 12 software equivalent to a max7320 plus a max7323. table 1. max7319?ax7329 family comparison (continued)
slave address and input pullup selection address inputs ad0 and ad2 determine the max7323 slave address, select which inputs have pullup resis- tors, and set the default logic state on outputs. pullups are enabled on the input ports in groups of two (see table 3). the max7319, max7321, max7322, and max7323 use a different range of slave addresses (110xxxx) than the max7320 (101xxxx). the max7323 slave address is determined on each i 2 c transmission, regardless of whether the transmission is actually addressing the max7323. the max7323 distin- guishes whether address inputs ad2 and ad0 are con- nected to sda or scl instead of fixed logic levels v+ or gnd during this transmission. therefore, the max7323 slave address can be configured dynamically in the application without cycling the device supply. on initial power-up, the max7323 cannot decode address inputs ad2 and ad0 fully until the first i 2 c transmission. ad0 and ad2 initially appear to be con- nected to v+ or gnd. this is important because the address selection determines the power-up default states of the output ports and i/o port initial logic state, and whether pullups are enabled. however, at power- up, the i 2 c sda and scl bus interface lines are high impedance at the pins of every device (master or slave) connected to the bus, including the max7323. this is guaranteed as part of the i 2 c specification. therefore, address inputs ad2 and ad0 that are connected to sda or scl normally appear at power-up to be con- nected to v+. the pullup selection logic uses ad0 to select whether pullups are enabled for ports p2 and p3, and to set the initial logic state for o0 and o1. ad2 selects whether pullups are enabled for ports p4 and p5 and sets the initial logic state for o6 and o7. the rule is that a logic-high, sda, or scl connection selects the pullups and sets the default logic state to high. a logic-low deselects the pullups and sets the default logic state low (see table 3). the port configu- ration is correct on power-up for a standard i 2 c config- uration, where sda or scl are pulled up to v+ by the external i 2 c pullup resistors. there are circumstances where the assumption that sda = scl = v+ on power-up is not true?or example, in applications in which there is legitimate bus activity during power-up. also, if sda and scl are terminated with pullup resistors to a different supply voltage than the max7323? supply voltage, and if that pullup supply rises later than the max7323? supply, then sda or scl may appear at power-up to be connected to gnd. in such applications, use the four address combinations that are selected by connecting address inputs ad2 max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os _______________________________________________________________________________________ 7 part i 2 c slave address inputs interrupt mask open- drain outputs push- pull outputs i 2 c data write i 2 c data read max7319 110xxxx 8 yes max7320 101xxxx 8

max7321 110xxxx up to 8 up to 8 max7322 110xxxx 4 yes 4 <0, 0, i5?2 transition flags, 0, 0> max7323 110xxxx up to 4 up to 4 4 <0, 0, p5?2 transition flags, 0, 0> max7328 0100xxx up to 8 up to 8 max7329 0111xxx up to 8 up to 8 table 2. read and write access to eight-port expander family
max7323 and ad0 to v+ or gnd (shown in bold in table 3). these selections are guaranteed to be correct at power-up, independent of sda and scl behavior. if one of the other 12 address combinations is used, an unexpected combination of pullups might be asserted until the first i 2 c transmission (to any device, not neces- sarily the max7323) is put on the bus. i/o port inputs i/o port inputs switch at the cmos logic levels as determined by the expander? supply voltage, and are overvoltage tolerant to +6v, independent of the expander? supply voltage. i/o port input transition detection all four i/o ports configured as inputs are monitored for changes since the expander was last accessed through the serial interface. the state of the i/o ports is stored in an internal ?napshot?register for transition monitoring. the snapshot is continuously compared with the actual input conditions, and if a change is detected for any port input, int is asserted to signal a state change. an internal transition flag is set for that port. the input ports are sampled (internally latched into the snapshot register) and the old transition flags cleared during the i 2 c acknowledge of every max7323 read and write access. the previous port transition flags are read through the serial interface as the sec- ond byte of a 2-byte read sequence. a long read sequence (more than 2 bytes) can be used to poll the expander continuously without the overhead of resending the slave address. if more than 2 bytes are read from the expander, the expander repeatedly returns the input port data, alternating with the transition flags. the inputs are repeatedly resampled and the transition flags repeatedly reset for each pair of bytes read. all changes that occur during a long read sequence are detected and reported. the int output is not reasserted during a read sequence to avoid recursive reentry into an interrupt service routine. instead, if a data change occurs that would normally cause the int output to be set, the int assertion is delayed until the stop condition. int is not reasserted upon a stop condition if the changed input data is read before the stop occurs. the int logic ensures that unnecessary interrupts are not asserted, yet data changes are detected and reported no matter when the change occurs. port outputs write 1 byte to the max7323 to set the output port lev- els for the four push-pull outputs, and the four open- drain i/o ports simultaneously. i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 8 _______________________________________________________________________________________ pin connection device address outputs power-up default 40k input pullups enabled ad2 ad0 a6 a5 a4 a3 a2 a1 a0 o7 o6 p5 p4 p3 p2 o1 o0 o7 o6 p5 p4 p3 p2 o1 o0 scl gnd110000011110000 yy scl v+ 110000111111111 yyyy scl scl 110001011111111 yyyy scl sda 110001111111111 yyyy sda gnd110010011110000 yy sda v+ 110010111111111 yyyy sda scl 110011011111111 yyyy sda sda 110011111111111 yyyy gndgnd110100000000000 gnd v+ 110100100001111 yy gnd scl 110101000001111 yy gndsda 110101100001111 yy v+ gnd110110011110000 yy v+ v+ 110110111111111 yyyy v+ scl 110111011111111 yyyy v+ sda 110111111111111 pullups are not enabled for push-pull outputs. yyyy pullups are not enabled for push-pull outputs. table 3. max7323 address map
serial interface serial addressing the max7323 operates as a slave that sends and receives data through an i 2 c interface. the interface uses a serial data line (sda) and a serial clock line (scl) to achieve bidirectional communication between master(s) and slave(s). the master initiates all data trans- fers to and from the max7323 and generates the scl clock that synchronizes the data transfer (figure 1). sda operates as both an input and an open-drain out- put. a pullup resistor, typically 4.7k , is required on sda. scl operates only as an input. a pullup resistor, typically 4.7k , is required on scl if there are multiple masters on the 2-wire interface, or if the master in a sin- gle-master system has an open-drain scl output. each transmission consists of a start condition sent by a master, followed by the max7323? 7-bit slave address plus r/ w bit, 1 or more data bytes, and finally a stop condition (figure 2). start and stop conditions both scl and sda remain high when the interface is not busy. a master signals the beginning of a transmis- sion with a start (s) condition by transitioning sda from high to low while scl is high. when the master has finished communicating with the slave, the master issues a stop (p) condition by transitioning sda from low to high while scl is high. the bus is then free for another transmission (figure 2). bit transfer one data bit is transferred during each clock pulse. the data on sda must remain stable while scl is high (figure 3). acknowledge the acknowledge bit is a clocked 9th bit the recipient uses to acknowledge receipt of each byte of data (figure 4). each byte transferred effectively requires 9 bits. the master generates the 9th clock pulse, and the recipient pulls down sda during the acknowledge clock pulse, such that the sda line is stable low during the high period of the clock pulse. when the master is transmitting to the max7323, the device generates the acknowledge bit because the max7323 is the recipient. when the max7323 is transmitting to the master, the master generates the acknowledge bit because the master is the recipient. slave address the max7323 has a 7-bit-long slave address (figure 5). the 8th bit following the 7-bit slave address is the r/ w bit. it is low for a write command, and high for a read command. the first (a6), second (a5), and third (a4) bits of the max7323 slave address are always 1, 1, and 0. connect ad2 and ad0 to gnd, v+ , sda, or scl to select slave address bits a3, a2, a1, and a0. the max7323 has 16 possible slave addresses (table 3), allowing up to 16 max7323 devices on an i 2 c bus. max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os _______________________________________________________________________________________ 9 scl sda t r t f t buf start condition stop condition repeated start condition start condition t su,sto t hd,sta t su,sta t hd,dat t su,dat t low t high t hd,sta figure 1. 2-wire serial interface timing details sda scl start condition stop condition sp figure 2. start and stop conditions
max7323 accessing the max7323 the max7323 is accessed through an i 2 c interface. the transition flags are cleared, and int is deasserted each time the device acknowledges the i 2 c slave address. a single-byte read from the max7323 returns the sta- tus of the four i/o ports and the four output ports (read back as inputs). a 2-byte read returns first the status of the four i/o ports and the four output ports (as for a single-byte read), fol- lowed by the four transition flags for the four i/o ports. a multibyte read (more than 2 bytes before the i 2 c stop bit) repeatedly returns the port data, alternating with the transition flags. as the input data is resampled for each transmission, and the transition flags are reset each time, a multibyte read continuously returns the current data and identifies any changing i/o ports. if a port data change occurs during the read sequence, int is reasserted after the i 2 c stop bit. the max7323 does not generate another interrupt during a single- byte or multibyte read. port data is sampled during the preceding i 2 c acknowledge bit (the acknowledge bit for the i 2 c slave address in the case of a single-byte or 2-byte read). a single-byte write to the max7323 sets the logic state of the four open-drain i/o ports and four push-pull outputs. in a 2-byte write to the max7323, the first byte sets the logic state of the four open-drain i/o ports and four push-pull outputs, while the second byte sets the inter- rupt mask bits for the four open-drain i/o ports. reading from the max7323 a read from the max7323 starts with the master trans- mitting the max7323? slave address with the r/ w bit set high. the max7323 acknowledges the slave address, and samples the ports during the acknowl- edge bit. int deasserts during the slave address acknowledge. typically, the master reads 1 or 2 bytes from the max7323, each byte being acknowledged by the mas- ter upon reception, with the exception of the last byte. when the master reads 1 byte from the max7323 it subsequently issues a stop condition (figure 6). the max7323 transmits the current port data, clears the change flags, and resets the transition detection. int deasserts during the slave acknowledge. the new snapshot data is the current input port data transmitted to the master, so any input port changes that occur dur- ing the transmission are detected. int remains high until the stop condition. the master can read 2 bytes from the max7323 and then issues a stop condition (figure 7). in this case, the max7323 transmits the current port data, followed by the change flags. the change flags are cleared, and transi- tion detection restarted. int goes high (high impedance if an external pullup resistor is not fitted) during the slave acknowledge. the new snapshot data is the current port data transmitted to the master, so any port changes occurring during the transmission are detected. int remains high until the stop condition. i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 10 ______________________________________________________________________________________ sda scl data line stable; data valid change of data allowed figure 3. bit transfer scl sda by transmitter clock pulse for acknowledgment start condition sda by receiver 12 89 s figure 4. acknowledge
max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os ______________________________________________________________________________________ 11 sda scl . 11 a3 a2 a1 a0 0 r/w msb lsb ack figure 5. slave address scl max7321 slave address s1 1 0 a p 1 port i/o t iv n p0 p1 p2 p3 p4 p5 p6 p7 d0 d1 d2 d3 d4 d5 d6 d7 port i/o int output r/w port snapshot t ph t ir port snapshot t psu t ip int remains high until stop condition data figure 6. reading the max7323 (1 data byte) scl max7321 slave address s110 a p 1 ports int output r/w port snapshot t iv t ph t ir a d0 d1 d2 d3 d4 d5 d6 d7 port snapshot t psu t ip d7 d6 d5 d4 d3 d2 d1 d0 n port snapshot int remains high until stop condition s = start condition p = stop condition shaded = slave transmission a = acknowledge n = not acknowledge o0 o1 p2 p3 p4 p5 o6 o7 0 0 f2 f3 f4 f5 0 0 port i/o interrupt flags figure 7. reading the max7323 (2 data bytes)
max7323 writing to the max7323 a write to the max7323 starts with the master transmit- ting the max7323? slave address with the r/ w bit set low. the max7323 acknowledges the slave address, and samples the input ports during acknowledge. int goes high (high impedance if an external pullup resistor is not fitted) during the slave acknowledge. the master can now transmit 1 or more bytes of data. the max7323 acknowledges these subsequent bytes of data and updates the interrupt mask register with each new byte until the master issues a stop condition (figure 8). applications information port input and i 2 c interface level translation from higher or lower logic voltages the max7323? sda, scl, ad0, ad2, rst , int , and p2?5 are overvoltage protected to +6v independent of v+. this allows the max7323 to operate from a lower supply voltage, such as +3.3v, while the i 2 c interface and/or some of the four i/o ports are driven from a higher logic level, such as +5v. the max7323 can operate from a higher supply volt- age, such as +3v, while the i 2 c interface and/or some of the four i/o ports p2?5 are driven from a lower logic level, such as +2.5v. apply a minimum voltage of 0.7 x v+ to assert a logic-high on any input. for example, a max7323 operating from a +5v supply may not recog- nize a +3.3v nominal logic-high. one solution for input- level translation is to drive the max7323 inputs from open-drain outputs. use a pullup resistor to v+ or a higher supply to ensure a high logic voltage greater than 0.7 x v+. port-output port-level translation the open-drain output architecture allows for level translation to higher or lower voltages than the max7323? supply. use an external pullup resistor on any output to convert the high-impedance logic-high condition to a positive voltage level. the resistor can be connected to any voltage up to +6v, and the resis- tor value chosen to ensure no more than 20ma is sunk in the logic-low condition. for interfacing cmos inputs, a pullup resistor value of 220k is a good starting point. use a lower resistance to improve noise immuni- ty, in applications where power consumption is less critical, or where a faster rise time is needed for a given capacitive load. each of the four output ports o0, o1, o6, and o7 has protection diodes to gnd (figure 9). when a port is dri- ven to a voltage lower than gnd, the protection diode clamps the output to a diode drop below gnd. each of the four i/o ports p2?5 also has a 40k (typ) pullup resistor that can be enabled or disabled. when a port is driven to a voltage higher than v+, the body diode of the pullup enable switch conducts and the 40k pullup resistor is enabled. when the max7323 is powered down (v+ = 0), each i/o port appears as a 40k resistor in series with a diode connected to zero. each port is protected to +6v under any of these circumstances (figure 10). i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 12 ______________________________________________________________________________________ scl sda start condition r/w slave address s0 12345678 aaa t pv data 1 data 2 t pv data to port data to port t pv data 2 valid data 1 valid internal write to port data out from port t pv s = start condition shaded = slave transmission p = stop condition n = not acknowledge figure 8. writing to the max7323
driving led loads when driving leds from one of the four output ports (o0, o1, o6, or o7), a resistor must be connected in series with the led to limit the led current to no more than 20ma. connect the led cathode to the max7323 port, and the led anode to v+ through the series cur- rent-limiting resistor, r led . set the port output low to illuminate the led. choose the resistor value according to the following formula: r led = (v supply - v led - v ol ) / i led where: r led is the resistance of the resistor in series with the led ( ). v supply is the supply voltage used to drive the led (v). v led is the forward voltage of the led (v). v ol is the output-low voltage of the max7323 when sinking i led (v). i led is the desired operating current of the led (a). for example, to operate a 2.2v red led at 10ma from a +5v supply: r led = (5 - 2.2 - 0.07) / 0.010 = 270 . max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os ______________________________________________________________________________________ 13 output v+ v+ ports o0, o1, o6, o7 max7323 figure 9. max7323 push-pull output port structure ports p2?5 pullup enable input output 40k g s d max7323 v+ v+ figure 10. max7323 i/o port structure i 2 c control o7 p4 p5 o6 p3 p2 o1 o0 int i/o ports power- on reset input filter rst sda scl ad2 ad0 max7323 functional diagram
max7323 driving load currents higher than 20ma the max7323 can be used to drive loads, such as relays, that draw more than 20ma by paralleling out- puts. use at least one output per 20ma of load current; for example, a 5v, 330mw relay draws 66ma, and therefore, requires four paralleled outputs. any combi- nation of outputs can be used as part of a load-sharing design because any combination of ports can be set or cleared at the same time by writing to the max7323. do not exceed a total sink current of 100ma for the device. the max7323 must be protected from the negative volt- age transient generated when switching off inductive loads (such as relays), by connecting a reverse-biased diode across the inductive load. choose the peak cur- rent for the diode to be greater than the inductive load? operating current. power-supply considerations the max7323 operates with a supply voltage of +1.71v to +5.5v over the -40? to +125? temperature range. bypass the supply to gnd with a ceramic capacitor of at least 0.047? as close as possible to the device. for the tqfn version, additionally connect the exposed paddle to gnd. i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 14 ______________________________________________________________________________________ 15 16 14 13 5 6 7 o1 p2 8 ad2 o7 o6 scl 13 v+ 4 12 10 9 ad0 rst p5 p4 gnd p3 max7323 o0 int 2 11 sda tqfn top view *ep *exposed paddle, connected to gnd + + pin configurations 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 ad0 v+ sda scl int o7 o6 p5 p4 max7323 qsop rst ad2 p2 o0 o1 p3 gnd + +
max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os ______________________________________________________________________________________ 15 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) qsop.eps
max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os 16 ______________________________________________________________________________________ package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) 12x16l qfn thin.eps 0.10 c 0.08 c 0.10 m c a b d d/2 e/2 e a1 a2 a e2 e2/2 l k e (nd - 1) x e (ne - 1) x e d2 d2/2 b l e l c l e c l l c l c package outline 21-0136 2 1 i 8, 12, 16l thin qfn, 3x3x0.8mm marking aaaa
max7323 i 2 c port expander with 4 push-pull outputs and 4 open-drain i/os maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 17 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) exposed pad variations codes pkg. t1233-1 min. 0.95 nom. 1.10 d2 nom. 1.10 max. 1.25 min. 0.95 max. 1.25 e2 12 n k a2 0.25 ne a1 nd 0 0.20 ref - - 3 0.02 3 0.05 l e e 0.45 2.90 b d a 0.20 2.90 0.70 0.50 bsc. 0.55 3.00 0.65 3.10 0.25 3.00 0.75 0.30 3.10 0.80 16 0.20 ref 0.25 - 0 4 0.02 4 - 0.05 0.50 bsc. 0.30 2.90 0.40 3.00 0.20 2.90 0.70 0.25 3.00 0.75 3.10 0.50 0.80 3.10 0.30 pkg ref. min. 12l 3x3 nom. max. nom. 16l 3x3 min. max. 0.35 x 45 pin id jedec weed-1 t1233-3 1.10 1.25 0.95 1.10 0.35 x 45 1.25 weed-1 0.95 t1633f-3 0.65 t1633-4 0.95 0.80 0.95 0.65 0.80 1.10 1.25 0.95 1.10 0.225 x 45 0.95 weed-2 0.35 x 45 1.25 weed-2 t1633-2 0.95 1.10 1.25 0.95 1.10 0.35 x 45 1.25 weed-2 package outline 21-0136 2 2 i 8, 12, 16l thin qfn, 3x3x0.8mm weed-1 1.25 1.10 0.95 0.35 x 45 1.25 1.10 0.95 t1233-4 t1633fh-3 0.65 0.80 0.95 0.225 x 45 0.65 0.80 0.95 weed-2 notes: 1. dimensioning & tolerancing conform to asme y14.5m-1994. 2. all dimensions are in millimeters. angles are in degrees. 3. n is the total number of terminals. 4. the terminal #1 identifier and terminal numbering convention shall conform to jesd 95-1 spp-012. details of terminal #1 identifier are optional, but must be located within the zone indicated. the terminal #1 identifier may be either a mold or marked feature. 5. dimension b applies to metallized terminal and is measured between 0.20 mm and 0.25 mm from terminal tip. 6. nd and ne refer to the number of terminals on each d and e side respectively. 7. depopulation is possible in a symmetrical fashion. 8. coplanarity applies to the exposed heat sink slug as well as the terminals . 9. drawing conforms to jedec mo220 revision c. 10. marking is for package orientation reference only. 11. number of leads shown are for reference only. 12. warpage not to exceed 0.10mm. 0.25 0.30 0.35 2 0.25 0 0.20 ref - - 0.02 0.05 0.35 8 2 0.55 0.75 2.90 2.90 3.00 3.10 0.65 bsc. 3.00 3.10 8l 3x3 min. 0.70 0.75 0.80 nom. max. tq833-1 1.25 0.25 0.70 0.35 x 45 weec 1.25 0.70 0.25 t1633-5 0.95 1.10 1.25 0.35 x 45 weed-2 0.95 1.10 1.25 ____________________revision history pages changed at rev 1: title change?ll pages, 1?7
login registe r english maxim > products > interface, interconnect, signal integrity > max7323 maxim > products > microcontrollers > max7323 maxim > products > optoelectronics > max7323 max7323 i2c port expander with 4 push-pull outputs and 4 open-drain i/os low operating supply voltage i2c port expander with 4 push-pull output s and 4 open-drain i/os overview technical documents ordering info related products user comments (0) all status active: in production. description data sheet the max7323 2-wire serial-interfaced peripheral feat ures eight i/o ports. four ports are push-pull outputs and the other four are open- drain i/o ports that are ov ervoltage protected up to +6v independent of the supply voltage. the four i/o ports configured as inputs are continuously monitor ed for state changes (transition detection). state changes are indi cated by the open-drain active-l ow int output. the interrupt is latched, allowing detection of transient changes. when the max 7323 is subsequently accessed through the serial interface, any pending interrupt is cleared. the four push-pull and four open- drain outputs are rated to sink 20ma and are capable of driving leds. the active-low rst input clears t he serial interface, terminating any i2c communication to or from the max7323. the max7323 uses two address inputs with four-lev el logic to allow 16 i2c slave addresses. the slave address also determines the power-up logic state for the i/o ports, and enables or disables internal 40k ? pullups for the input ports in groups of two ports. the max7323 is one device in a family of pin-co mpatible port expanders with a choice of input ports, open-drain i/o ports, and push-pull output ports (see table 1 in the full data sheet). the max7323 is available in 16- pin qsop and 16-pin tqfn packages , and is specif ied over the automotive temperature range (-40c to +125c). full data sheet download rev 1 (pdf, 216kb) e-mail key features applications/uses z 400khz i2c serial interface z +1.71v to +5.5v operating voltage z 4 push-pull output ports ra ted at 20ma sink current z 4 open-drain i/o ports rat ed to 20ma sink current z 4 i/o ports are overvolt age protected to +6v z transient changes are latched, allowi ng detection between read operations z active-low int output alerts change on inputs z ad0 and ad2 inputs select from 16 slave addresses z low 0.6a (typ) standby current z -40c to +125c operating temperature range z automotive z cell phones z notebooks z raid z san/nas z servers key specifications: i/o port expanders part number features interface i/o outputs reset input interr.out over voltage protect. drive current (ma) v supply (v) v supply (v) price min max see notes max7323 16 slave ids low standby current open drain outputs port pullups transition detection serial - i 2 c compatible serial 2-wire 400kbit 4 4 yes yes 6v 25 1.71 5.5 $1.01 @1k see all i/o port expanders (35) pricing notes: this pricing is budgetary, for comparing si milar parts. prices are in u.s. dollars and subject to change. quantity pricing may vary substantially and in ternational prices may differ due to local duties, taxes, fees, and exchange rates. for volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor. diagram page 1 of 3 max7323 i2c port expander with 4 push -pull outputs and 4 open-drain i/os 03-ma y -2011 htt p ://www.maxim-ic.com /datasheet/index.mv p /id/5285/t/al
typical application circuit design guides displays (pdf) reliability reports show fit data for: max7323 go request reliability report for: max7323 go software/models none ordering information notes: 1. other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales . 2. didn't find what you need? ask our applications engineers. expert assistance in finding parts, usually within one business day. 3. part number suffixes: t or t&r = tape and reel; + = rohs/lead- free; # = rohs/lead-exempt; -d = drypack; -u/+u on ds parts = c ut tape. more: see full data sheet or maxim product naming conventions . 4. * some packages have variations, listed on the drawing. "pkgcode/variation" tells which variation the product uses. note that "+ ", "#", "-" in the part number suffix describes rohs status. package drawings ma y show a different suffix character. filters part number: package: any temperature: any tape and reel go max7323 free sample buy status package: type pins footprint drawing code/var * temp rohs/lead-free? materials analysis max7323aee+t buy active qsop; land pattern: not available -40c to +125c see data sheet max7323aee+ sample buy active qsop;16 pin;30.9 mm2 outline drawing: 21-0055 (pdf) land pattern: 90-0167 (pdf) use pkgcode/variation: e16+4 * -40c to +125c rohs/lead-free: lead free materials analysis max7323aee buy active qsop;16 pin;30.9 mm2 outline drawing: 21-0055 (pdf) land pattern: 90-0167 (pdf) use pkgcode/variation: e16-4 * -40c to +125c rohs/lead-free: no materials analysis max7323aee-t buy active qsop;16 pin land pattern: not available -40c to +125c see data sheet max7323ate+ sample buy active tqfn;16 pin;9.6 mm2 outline drawing: 21-0136 (pdf) land pattern: 90-0031 (pdf) use pkgcode/variation: t1633+4 * -40c to +125c rohs/lead-free: lead free materials analysis max7323ate+t buy active tqfn; land pattern: not available -40c to +125c see data sheet max7323ate-t buy active tqfn;16 pin land pattern: not available -40c to +125c see data sheet max7323ate buy active tqfn;16 pin;9.6 mm2 outline drawing: 21-0136 (pdf) land pattern: 90-0031 (pdf) use pkgcode/variation: t1633-4 * -40c to +125c rohs/lead-free: no materials analysis page 2 of 3 max7323 i2c port expander with 4 push -pull outputs and 4 open-drain i/os 03-ma y -2011 htt p ://www.maxim-ic.com /datasheet/index.mv p /id/5285/t/al
document ref.: 19-3806 rev 1; 2007-09-18 this page last modified: 2009-09-04 similar products by function max7328, max7329 i2c port expanders with eight i/o ports max7321 i2c port expander with 8 open-drain i/os max7320 i2c port expander with eight push-pull outputs max7319 i2c port expander with eight inputs and maskable transition detection max7322 i2c port expander with 4 push-pull outputs and 4 inputs see all i/o port expanders (35 products) similar products by application blood glucose meters > input/output (i/o) expanders gpio > cellular handsets more information topmark coding max7323 your comments login or register to post a comment. didn't find what you need? z next day product selection assistan ce from applications engineers z parametric search z applications help overview technical documents ordering info related products description key features applications/uses key specifications diagram notes and comments data sheet application notes evaluation kits design guides reliability reports software/models price and availability samples buy online package information lead-free information similar products by function similar products by application evaluation kits products with similar part numbers products used with this page 3 of 3 max7323 i2c port expander with 4 push -pull outputs and 4 open-drain i/os 03-ma y -2011 htt p ://www.maxim-ic.com /datasheet/index.mv p /id/5285/t/al

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