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march 2009 rev 11 1/29 1 m34c02-r 2 kbit serial i2c bus eeprom for dimm serial presence detect features software data protection for lower 128 bytes two-wire i 2 c serial interface 400 khz transfer rates single supply voltage: ? 1.8 v to 5.5 v byte and page write (up to 16 bytes) random and sequential read modes self-timed programming cycle automatic address incrementing enhanced esd/latch-up protection more than 1 million write cycles more than 40 year data retention packages ?ecopack ? (rohs compliant) tssop8 (dw) 169 mil width ufdfpn8 (mb) 2 x 3 mm (mlp) www.st.com
contents m34c02-r 2/29 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 serial clock (scl) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 serial data (sda) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 chip enable (e0, e1, e2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4 write control (wc ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.5 v ss ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 supply voltage (v cc ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6.1 operating supply voltage v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6.2 internal device reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6.3 power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 start condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 stop condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 acknowledge bit (ack) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.4 data input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.5 memory addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.6 setting the software write-protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.7 write operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.7.1 byte write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.7.2 page write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.7.3 minimizing system delays by polling on ack . . . . . . . . . . . . . . . . . . . . . 16 3.8 read operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.8.1 random address read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.8.2 current address read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.8.3 sequential read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.8.4 acknowledge in read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4 use within a dram dimm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.1 programming the m34c02-r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
m34c02-r contents 3/29 5 initial delivery state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6 maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 9 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 10 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
list of tables m34c02-r 4/29 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 2. device select code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 3. operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4. dram dimm connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 5. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 6. operating conditions (m34c02-r) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 table 7. ac measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 8. input parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 9. dc characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 10. ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 11. ufdfpn8 (mlp8) 8-lead ultra thin fine pitch dual flat package no lead 2 x 3 mm, package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 12. tssop8 ? 8 lead thin shrink small outline, package mechanical data. . . . . . . . . . . . . . . . 26 table 13. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 14. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
m34c02-r list of figures 5/29 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 2. tssop and mlp connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3. chip enable input connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 4. maximum r p value versus bus parasitic capacitance (c) for an i2c bus . . . . . . . . . . . . . . 9 figure 5. i 2 c bus protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 6. setting the write protection register (wc = 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 7. result of setting the write protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 8. write mode sequences in a non write-protected area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 9. write cycle polling flowchart using ack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6 figure 10. read mode sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 11. serial presence detect block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 12. ac measurement i/o waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 13. ac waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 14. ufdfpn8 (mlp8) 8-lead ultra thin fine pitch dual flat package no lead 2 x 3 mm, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 figure 15. tssop8 ? 8 lead thin shrink small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . 26
description m34c02-r 6/29 1 description the m34c02-r is a 2 kbit serial eeprom memories able to lock permanently the data in its first half (from location 00h to 7fh). this facility has been de signed specifically for use in dram dimms (dual interline memory modules) with serial presence detect. all the information concerning the dram module configuration (such as its access speed, its size, its organization) can be kept write protected in the first half of the memory. this bottom half of the memory area can be write-protected using a specially designed software write protection mechanism. by sendi ng the device a specific sequence, the first 128 bytes of the memory become permanently write protected. care must be taken when using this sequence as its effect cannot be reversed. in addition, the device allows the entire memory area to be write protected, using the wc input (for example by tieing this input to v cc ). these i 2 c-compatible electrically erasable pr ogrammable memory (eeprom) devices are organized as 256 8 bits. i 2 c uses a two wire serial interface, comprising a bidirectional data line and a clock line. the device carries a built-in 4-bit device type identifier code (1010) in accordance with the i 2 c bus definition to access the memory area and a second device type identifier code (0110) to access the protection register. these codes are used together with three chip enable inputs (e2, e1, e0) so that up to eight 2kbit devices may be attached to the i2c bus and selected individually. the device behaves as a slave device in the i 2 c protocol, with all memory operations synchronized by the serial clock. read and write operations are initiated by a start condition, generated by the bus master. the start condition is followed by a device select code and rw bit (as described in ta b l e 2 ), terminated by an acknowledge bit. when writing data to the memory, the memory inserts an acknowledge bit during the 9 th bit time, following the bus master?s 8-bit transmission. when data is read by the bus master, the bus master acknowledges the receipt of the data byte in the same way. data transfers are terminated by a stop condition after an ack for write, and after a noack for read. figure 1. logic diagram ai01931c 3 e0-e2 sda v cc m34c02-r wc scl v ss
m34c02-r description 7/29 figure 2. tssop and mlp connections (top view) 1. see section 8: package mechanical data for package dimensions, and how to identify pin-1. table 1. signal names signal name description e0, e1, e2 chip enable sda serial data scl serial clock wc write control v cc supply voltage v ss ground sda v ss scl wc e1 e0 v cc e2 ai01932e m34c02-r 1 2 3 4 8 7 6 5
signal description m34c02-r 8/29 2 signal description 2.1 serial clock (scl) this input signal is used to strobe all data in and out of the device. in applications where this signal is used by slave devices to synchronize the bus to a slower clock, the bus master must have an open drain output, and a pull-up resistor can be connected from serial clock (scl) to v cc . ( figure 4 indicates how the value of the pull-up resistor can be calculated). in most applications, though, this method of sy nchronization is not employed, and so the pull- up resistor is not necessary, provided that the bus master has a push-pull (rather than open drain) output. 2.2 serial data (sda) this bidirectional signal is used to transfer data in or out of the device. it is an open drain output that may be wire-or?ed with other open drain or open collector signals on the bus. a pull up resistor must be connected from serial data (sda) to v cc . ( figure 4 indicates how the value of the pull-up resistor can be calculated). 2.3 chip enable (e0, e1, e2) these input signals are used to set the value that is to be looked for on the three least significant bits (b3, b2, b1) of the 7-bit device select code. these inputs must be tied to v cc or v ss to establish the device select code. figure 3. chip enable input connection 2.4 write control (wc ) this input signal is provided for protecting the contents of the whole memory from inadvertent write operat ions. write control (wc ) is used to enable (when driven low) or disable (when driven high) write instructions to the entire memory area or to the protection register. when write control (wc ) is tied low or left unconnected, the write protection of the first half of the memory is determined by the status of the protection register. ai12819b v cc m34c02-r v ss e i v cc m34c02-r v ss e i
m34c02-r signal description 9/29 2.5 v ss ground v ss is the reference for the v cc supply voltage. 2.6 supply voltage (v cc ) 2.6.1 operating supply voltage v cc prior to selecting the memory and issuing instructions to it, a valid and stable v cc voltage within the specified [v cc (min), v cc (max)] range must be applied (see ta bl e 6 ). in order to secure a stable dc supply voltage, it is recommended to decouple the v cc line with a suitable capacitor (usually of the order of 10nf to 100nf) close to the v cc /v ss package pins. this voltage must remain stable and valid until the end of the transmission of the instruction and, for a write instruction, until the completion of the internal write cycle (t w ). 2.6.2 internal device reset in order to prevent inadvertent write operations during power-up, a power on reset (por) circuit is included. at power-up (continuous rise of v cc ), the device will not respond to any instruction until v cc has reached the power on reset threshold voltage (this threshold is lower than the minimum v cc operating voltage defined in ta b l e 6 ). when v cc has passed the por threshold, the device is reset and in the standby power mode. 2.6.3 power-down at power-down (where v cc decreases continuously), as soon as v cc drops from the normal operating voltage to below the power on reset threshold voltage, the device stops responding to any inst ruction sent to it. during power-down, the device must be deselected and in standby power mode (that is there should be no internal write cycle in progress). figure 4. maximum r p value versus bus parasitic capacitance (c) for an i2c bus ai01665b v cc c sda r p master r p scl c 100 0 4 8 12 16 20 c (pf) maximum rp value (k ) 10 1000 fc = 400khz fc = 100khz
signal description m34c02-r 10/29 figure 5. i 2 c bus protocol table 2. device select code device type identifier (1) 1. the most significant bit, b7, is sent first. chip enable address (2) 2. e0, e1 and e2 are compared against the respec tive external pins on the memory device. rw b7 b6 b5 b4 b3 b2 b1 b0 memory area select code (two arrays) 1010e2e1e0rw protection register select code 0110e2e1e0rw scl sda scl sda sda start condition sda input sda change ai00792b stop condition 1 23 7 89 msb ack start condition scl 1 23 7 89 msb ack stop condition
m34c02-r device operation 11/29 3 device operation the device supports the i 2 c protocol. this is summarized in figure 5 . any device that sends data on to the bus is defined to be a transmitter, and any device that reads the data to be a receiver. the device that controls the data transfer is known as the bus master, and the other as the slave device. a data transfer can on ly be initiated by the bus master, which will also provide the serial clock for synchronization . the memory device is always a slave in all communication. 3.1 start condition start is identified by a falling edge of serial da ta (sda) while serial clock (scl) is stable in the high state. a start condition must precede any data transfer command. the device continuously monitors (except during a write cycle) serial data (sda) and serial clock (scl) for a start condition, and will not respond unless one is given. 3.2 stop condition stop is identified by a rising edge of serial data (sda) while serial clock (scl) is stable and driven high. a stop condition terminates communication between the device and the bus master. a read command that is followed by noack can be followed by a stop condition to force the device into the standby mode. a stop condition at the end of a write command triggers the internal eeprom write cycle. 3.3 acknowledge bit (ack) the acknowledge bit is used to indicate a successful byte transfer. the bus transmitter, whether it be bus master or slave device, releases serial data (sda) after sending eight bits of data. during the 9 th clock pulse period, the receiver pulls serial data (sda) low to acknowledge the receipt of the eight data bits. 3.4 data input during data input, the device samples serial data (sda) on the rising edge of serial clock (scl). for correct device operation, serial data (sda) must be stable during the rising edge of serial clock (scl), and the serial data (sda) signal must change only when serial clock (scl) is driven low.
device operation m34c02-r 12/29 3.5 memory addressing to start communication between the bus master and the slave device, the bus master must initiate a start condition. follo wing this, the bus master sends the device select code, shown in ta b l e 2 (on serial data (sda), most significant bit first). the device select code consists of a 4-bit device type identifier, and a 3-bit chip enable ?address? (e2, e1, e0). to address the memory array, the 4-bit device type identifier is 1010b; to address the protection register, it is 0110b. up to eight memory devices can be connected on a single i 2 c bus. each one is given a unique 3-bit code on the chip enable (e0, e1, e2) inputs. when the device select code is received, the device only responds if the chip enable address is the same as the value on the chip enable (e0, e1, e2) inputs. the 8 th bit is the read/write bit (rw ). this bit is set to 1 for read and 0 for write operations. if a match occurs on the device select code, the corresponding device gives an acknowledgment on serial data (sda) during the 9 th bit time. if the device does not match the device select code, it deselects itself from the bus, and goes into standby mode. figure 6. setting the write protection register (wc = 0) table 3. operating modes mode rw bit wc (1) 1. x = v ih or v il . bytes initial sequence current address read 1 x 1 start, device select, rw = 1 random address read 0x 1 start, device select, rw = 0, address 1 x restart, device select, rw = 1 sequential read 1 x 1 similar to current or random address read byte write 0 v il 1 start, device select, rw = 0 page write 0 v il 16 start, device select, rw = 0 start sda line ai01935b ack word address value (don't care) ack data value (don't care) stop ack control byte bus activity master bus activity
m34c02-r device operation 13/29 3.6 setting the software write-protection the m34c02-w has a hardware write-protection feature, using the write control (wc ) signal. this signal can be driven high or low, and must be held constant for the whole instruction sequence. when write control (wc ) is held high, the whole memory array (addresses 00h to ffh) is write protected. when write control (wc ) is held low, the write protection of the memory array is dependent on whether software write-protection has been set. software write-protection allows the bottom half of the memory area (addresses 00h to 7fh) to be permanently write protected irrespective of subsequent states of the write control (wc ) signal. the write protection feature is activated by writing once to the protection register. the protection register is accessed with the device select code set to 0110b (as shown in ta bl e 2 ), and the e2, e1 and e0 bits set according to the states being applied on the e2, e1 and e0 signals. as for any other write command, write control (wc ) needs to be held low. address and data bytes must be sent with this command, but their values are all ignored, and are treated as don?t care. once the protection register has been written, the write protection of the first 128 bytes of the memory is enabled, and it is not possible to unprotect these 128 bytes, even if the device is powered off and on, and regardless the state of write control (wc ). when the protection register has been written, the m34c02-w no longer responds to the device type identifier 0110b in either read or write mode. figure 7. result of setting the write protection default eeprom memory area state before write access to the protect register ai01936c standard array ffh standard array 80h 7fh 00h standard array ffh write protected array 80h 7fh 00h state of the eeprom memory area after write access to the protect register memory area
device operation m34c02-r 14/29 3.7 write operations following a start condition the bus master sends a device select code with the rw bit reset to 0. the device acknowledges this, as shown in figure 8 , and waits for an address byte. the device responds to the address byte with an acknowledge bit, and then waits for the data byte. when the bus master generates a stop condition immediately after the ack bit (in the ?10 th bit? time slot), either at the end of a byte write or a page write, the internal memory write cycle is triggered. a stop condition at any other time slot does not trigger the internal write cycle. during the internal write cycle, serial data (sda) and serial clock (scl) are ignored, and the device does not respond to any requests. 3.7.1 byte write after the device select code and the address byte, the bus master sends one data byte. if the addressed location is hardware write-protected, the device replies to the data byte with noack, and the location is not modified. if, instead, the addressed location is not write- protected, the device replies with ack. the bus master terminates the transfer by generating a stop condition, as shown in figure 8 . 3.7.2 page write the page write mode allows up to 16 bytes to be written in a single write cycle, provided that they are all located in the same page in the memory: that is, the most significant memory address bits are the same. if more byte s are sent than will fit up to the end of the page, a condition known as ?roll-over? occurs. this should be avoided, as data starts to become overwritten in an implementation dependent way. the bus master sends from 1 to 16 bytes of data, each of which is acknowledged by the device if write control (wc ) is low. if the addressed location is hardware write-protected, the device replies to the data byte with noack, and the locations are not modified. after each byte is transferred, the internal byte address counter (the 4 least significant address bits only) is incremented. the transfer is terminated by the bus master generating a stop condition.
m34c02-r device operation 15/29 figure 8. write mode sequences in a non write-protected area stop start byte write dev sel byte addr data in start page write dev sel byte addr data in 1 data in 2 ai01941 stop data in n ack ack ack r/w ack ack ack r/w ack ack
device operation m34c02-r 16/29 3.7.3 minimizing system delays by polling on ack during the internal write cycle, the device disconnects itself from the bus, and writes a copy of the data from its internal latches to the memory cells. the maximum write time (t w ) is shown in ta bl e 1 0 and ta bl e 1 2 , but the typical time is shorter. to make use of this, a polling sequence can be used by the bus master. the sequence, as shown in figure 9 , is: initial condition: a write cycle is in progress. step 1: the bus master issues a start condition followed by a device select code (the first byte of the new instruction). step 2: if the device is busy with the inte rnal write cycle, no ack will be returned and the bus master goes back to step 1. if the device has terminated the internal write cycle, it responds with an ack, indicating that the device is ready to receive the second part of the instruction (the first byte of this instruction having been sent during step 1). figure 9. write cycle polling flowchart using ack write cycle in progress ai01847c next operation is addressing the memory start condition device select with rw = 0 ack returned yes no yes no restart stop data for the write operation device select with rw = 1 send address and receive ack first byte of instruction with rw = 0 already decoded by the device yes no start condition continue the write operation continue the random read operation
m34c02-r device operation 17/29 3.8 read operations read operations are performed independently of whether hardware or software protection has been set. the device has an internal address counter which is incremented each time a byte is read. 3.8.1 random address read a dummy write is first performed to load the address into this address counter (as shown in figure 10 ) but without sending a stop condition. then, the bus master sends another start condition, and repeats the device select code, with the rw bit set to 1. the device acknowledges this, and outputs the contents of the addressed byte. the bus master must not acknowledge the byte, and terminates the transfer with a stop condition. 3.8.2 current address read for the current address read operation, following a start condition, the bus master only sends a device sele ct code with the rw bit set to 1. the device acknowledges this, and outputs the byte addressed by the internal address counter. the counter is then incremented. the bus master terminates the transfer with a stop condition, as shown in figure 10 , without acknowledging the byte. 3.8.3 sequential read this operation can be used after a current address read or a random address read. the bus master does acknowledge the data byte output, and sends additional clock pulses so that the device continues to output the next byte in sequence. to terminate the stream of bytes, the bus master must not acknowledge the last byte, and must generate a stop condition, as shown in figure 10 . the output data comes from consecutive addresses, with the internal address counter automatically incremented after each byte output. after the last memory address, the address counter ?rolls-over?, and the device continues to output data from memory address 00h. 3.8.4 acknowledg e in read mode for all read commands, the device waits, after each byte read, for an acknowledgment during the 9 th bit time. if the bus master does not drive serial data (sda) low during this time, the device terminates the data transfer and switches to its standby mode.
device operation m34c02-r 18/29 figure 10. read mode sequences 1. the seven most significant bits of the dev ice select code of a random read (in the 1 st and 3 rd bytes) must be identical. start dev sel * byte addr start dev sel data out 1 ai01942 data out n stop start current address read dev sel data out random address read stop start dev sel * data out sequential current read stop data out n start dev sel * byte addr sequential random read start dev sel * data out 1 stop ack r/w no ack ack r/w ack ack r/w ack ack ack no ack r/w no ack ack ack r/w ack ack r/w ack no ack
m34c02-r use within a dram dimm 19/29 4 use within a dram dimm in the application, the m34c02-r is soldered directly in the printed circuit module. the 3 chip enable inputs (pins 1, 2 and 3) are wired at v cc or v ss through the dimm socket (see ta bl e 4 ). the pull-up resistors needed for normal behavior of the i 2 c bus are connected on the i 2 c bus of the mother-board (as shown in figure 11 ). the write control (wc ) of the m34c02-r can be left unconnected. however, connecting it to v ss is recommended, to maintain full read and write access. 4.1 programming the m34c02-r when the device is delivered, full read and write access is given to the whole memory array. it is recommended that the first step is to use the test equipment to write the module information (such as its access speed, its size, its organization) to the first half of the memory, starting from the first memory location. when the data has been validated, the test equipment can send a write command to the protection register, using the device select code ?01100000b? followed by an address and data byte (made up of don?t care values) as shown in figure 6 . the first 128 bytes of the memory area are then write-protected, and the m34c02-r will no longer respond to the specific device select code ?0110000xb?. it is not possible to reverse this sequence. table 4. dram dimm connections dimm position e2 e1 e0 0 v ss v ss v ss 1 v ss v ss v cc 2 v ss v cc v ss 3 v ss v cc v cc 4 v cc v ss v ss 5 v cc v ss v cc 6 v cc v cc v ss 7 v cc v cc v cc
initial delivery state m34c02-r 20/29 5 initial delivery state the device is delivered with all bits in the memory array set to 1 (each byte contains ffh). figure 11. serial presence detect block diagram 1. e0, e1 and e2 are wired at each dimm socket in a binary sequence for a maximum of 8 devices. 2. common clock and common data are shared across all the devices. 3. pull-up resistors are r equired on all sda and scl bus lines (typically 4.7 k ) because these lines are open drain when used as outputs. r = 4.7k ai01937 dimm position 7 sda scl e0 e1 e2 v cc dimm position 6 sda scl e0 e1 e2 dimm position 5 sda scl e0 e1 e2 dimm position 4 sda scl e0 e1 e2 dimm position 3 sda scl e0 e1 e2 dimm position 2 sda scl e0 e1 e2 v cc dimm position 1 sda scl e0 e1 e2 dimm position 0 sda scl e0 e1 e2 v ss v ss v ss v cc v ss v ss v cc v cc v ss v cc v cc v ss v ss v cc scl line sda line from the motherboard i 2 c master controller
m34c02-r maximum rating 21/29 6 maximum rating stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not imp lied. exposure to absolute ma ximum rating conditions for extended periods may affect device reliability. refer also to the stmicroelectronics sure program and other relevant quality documents. table 5. absolute maximum ratings symbol parameter min. max. unit t a ambient operating temperature ?40 90 c t stg storage temperature ?65 150 c t lead lead temperature during soldering (1) 1. compliant with jedec std j-std-020c (for smal l body, sn-pb or pb assembly), the st ecopack ? 7191395 specification, and the european directive on re strictions on hazardous substances (rohs) 2002/95/eu. see (1) c v io input or output voltage ?0.50 6.5 v v cc supply voltage ?0.50 6.5 v v esd electrostatic discharge voltage (human body model) (2) 2. jedec std jesd22-a114a (c1=100 pf, r1=1500 , r2=500 ) ?4000 4000 v
dc and ac parameters m34c02-r 22/29 7 dc and ac parameters this section summarizes the operating and measurement conditions, and the dc and ac characteristics of the device. the parameters in the dc and ac characteristic tables that follow are derived from tests performed under the measurement conditions summarized in the relevant tables. designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parameters. figure 12. ac measurement i/o waveform table 6. operating conditions (m34c02-r) symbol parameter min. max. unit v cc supply voltage 1.8 5.5 v t a ambient operating temperature ?40 85 c table 7. ac measurement conditions symbol parameter min. max. unit c l load capacitance 100 pf input rise and fall times 50 ns input levels 0.2v cc to 0.8v cc v input and output timing reference levels 0.3v cc to 0.7v cc v table 8. input parameters symbol parameter (1),(2) 1. t a = 25c, f = 400khz 2. sampled only, not 100% tested. test condition min. max. unit c in input capacitance (sda) 8 pf c in input capacitance (other pins) 6 pf z wcl wc input impedance v in < 0.3 v 15 70 k z wch wc input impedance v in > 0.7v cc 500 k t ns pulse width ignored (input filter on scl and sda) single glitch 100 ns ai00825b 0.8v cc 0.2v cc 0.7v cc 0.3v cc input and output timing reference levels input levels
m34c02-r dc and ac parameters 23/29 table 9. dc characteristics symbol parameter test condition (in addition to those in table 6 ) min. max. unit i li input leakage current (scl, sda, e0, e1 and e2) v in = v ss or v cc 2 a i lo output leakage current v out = v ss or v cc, sda in hi-z 2 a i cc supply current v cc = 5v, f c = 400 khz (clock rise/fall time < 50 ns) 2ma v cc = 2.5 v, f c = 400 khz (clock rise/fall time < 50 ns) 1ma v cc = 1.8 v, f c = 400 khz (clock rise/fall time < 50 ns) 1ma i cc1 standby supply current v in = v ss or v cc , v cc = 5 v 1 a v in = v ss or v cc , 1.8 v v cc < 2.5 v 0.5 a v il input low voltage (1) 1. the voltage source driv ing only e0, e1 and e2 inputs must provide an impedance of less than 1k . 2.5 v v cc 5.5 v ? 0.3 0.3v cc v 1.8 v v cc < 2.5 v ? 0.3 0.25v cc v v ih input high voltage (1) 0.7v cc v cc +1 v v ol output low voltage i ol = 3 ma, v cc = 5 v 0.4 v i ol = 2.1 m a, 2.2 v v cc < 2.5 v 0.4 v i ol = 0.15 ma, v cc = 1.8 v 0.2 v table 10. ac characteristics test conditions specified in table 7 symbol alt. parameter min. max. unit f c f scl clock frequency 400 khz t chcl t high clock pulse width high 600 ns t clch t low clock pulse width low 1300 ns t dl1dl2 (1) 1. sampled only, not 100% tested. t f sda fall time 20 300 ns t dxcx t su:dat data in setup time 100 ns t cldx t hd:dat data in hold time 0 ns t clqx t dh data out hold time 200 ns t clqv (2) 2. to avoid spurious start and stop conditions, a minimum delay is plac ed between scl=1 and the falling or rising edge of sda. t aa clock low to next data valid (access time) 200 900 ns t chdx (3) 3. for a restart condition, or following a write cycle. t su:sta start condition setup time 600 ns t dlcl t hd:sta start condition hold time 600 ns t chdh t su:sto stop condition setup time 600 ns t dhdl t buf time between stop condition and next start condition 1300 ns t w t wr write time 10 ms
dc and ac parameters m34c02-r 24/29 figure 13. ac waveforms scl sda in scl sda out scl sda in tchcl tdlcl tchdx start condition tclch tdxcx tcldx sda input sda change tchdh tdhdl stop condition data valid tclqv tclqx tchdh stop condition tchdx start condition write cycle tw ai00795c start condition
m34c02-r package mechanical data 25/29 8 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 14. ufdfpn8 (mlp8) 8-lead ultra thin fine pitch dual flat package no lead 2 x 3 mm, package outline 1. drawing is not to scale. 2. the central pad (the area e2 by d2 in the abov e illustration) is pulle d, internally, to v ss . it must not be allowed to be connected to any other voltage or sig nal line on the pcb, for example during the soldering process. table 11. ufdfpn8 (mlp8) 8-lead ultra thin fine pitch dual flat package no lead 2 x 3 mm, package mechanical data symbol millimeters inches (1) 1. values in inches are converted from mm and rounded to 4 decimal digits. typ min max typ min max a 0.550 0.450 0.600 0.0217 0.0177 0.0236 a1 0.020 0.000 0.050 0.0008 0.0000 0.0020 b 0.250 0.200 0.300 0.0098 0.0079 0.0118 d 2.000 1.900 2.100 0.0787 0.0748 0.0827 d2 1.600 1.500 1.700 0.0630 0.0591 0.0669 e 3.000 2.900 3.100 0.1181 0.1142 0.1220 e2 0.200 0.100 0.300 0.0079 0.0039 0.0118 e 0.500 - - 0.0197 - - l 0.450 0.400 0.500 0.0177 0.0157 0.0197 l1 0.150 0.0059 l3 0.300 0.0118 ddd (2) 2. applied for exposed die paddle and terminals. exclude embedding part of exposed die paddle from measuring. 0.080 0.0031 d e ufdfpn-01 a a1 ddd l1 e b d2 l e2 l3
package mechanical data m34c02-r 26/29 figure 15. tssop8 ? 8 lead thin shrink small outline, package outline 1. drawing is not to scale. table 12. tssop8 ? 8 lead thin shrink small outline, package mechanical data symbol millimeters inches (1) 1. values in inches are converted from mm and rounded to 4 decimal digits. typ. min. max. typ. min. max. a 1.200 0.0472 a1 0.050 0.150 0.0020 0.0059 a2 1.000 0.800 1.050 0.0394 0.0315 0.0413 b 0.190 0.300 0.0075 0.0118 c 0.090 0.200 0.0035 0.0079 cp 0.100 0.0039 d 3.000 2.900 3.100 0.1181 0.1142 0.1220 e 0.650 ? ? 0.0256 ? ? e 6.400 6.200 6.600 0.2520 0.2441 0.2598 e1 4.400 4.300 4.500 0.1732 0.1693 0.1772 l 0.600 0.450 0.750 0.0236 0.0177 0.0295 l1 1.000 0.0394 0 8 0 8 tssop8am 1 8 cp c l e e1 d a2 a e b 4 5 a1 l1
m34c02-r part numbering 27/29 9 part numbering for a list of available options (speed, package, etc.) or for further information on any aspect of this device, please contact your nearest st sales office. table 13. ordering information scheme example: m34c02 ? r mb 6 t p device type m34 = assp i 2 c serial access eeprom device function 02 = 2 kbit (256 x 8) operating voltage r = v cc = 1.8 v to 5.5 v (400 khz) package mb = udfdfpn8 (mlp8) dw = tssop8 (169 mils width) device grade 6 = industrial temperature range, ?40 to 85 c. device tested with standard test flow option blank = standard packing t = tape and reel packing plating technology p or g = ecopack ? (rohs compliant)
revision history m34c02-r 28/29 10 revision history table 14. document revision history date revision description of revision 27-dec-1999 2.0 adjustments to the formatting. 0 to 70c temperature range removed from dc and ac tables. no change to description of device, or parameters 07-dec-2000 2.1 new definition of lead soldering temperature absolute rating for certain packages 13-mar-2001 2.2 -r voltage range added 18-jul-2002 2.3 tssop8 (3x3mm2 body size) package (msop8) added 22-may-2002 2.4 vfdfpn8 package (mlp8) added 21-jul-2003 3.0 document reformatted. -f voltage range added. 17-mar-2004 4.0 table of contents added. mlp package changed. absolute maximum ratings for v io (min) and v cc (min) changed. soldering temperature information clarified for rohs compliant devices. device grade information clarified 14-apr-2004 5.0 typos corrected in ordering information example 26-aug-2004 6.0 device grade clarified. product list summary table added 30-nov-2004 7.0 so8 package removed. 14-oct-2005 8.0 m34c02-r operating frequency upgraded to 400 khz. modified section 1.1: device internal reset , figure 4: maximum r p value versus bus parasitic capacitance (c) for an i2c bus , table 8: input parameters , i cc1 values in table 11: dc characteristics (m34c02-w) , ta b l e 9 : d c characteristics , table 15: dc characteristics (m34c02-w-f) and moved m34c02-r to table 10: ac characteristics . added figure 3: chip enable input connection . added ecopack? and ambient operating temperature information. 11-apr-2006 9 bn and ds (pdip and tssop8) packages removed. m34c02-f part number removed. test conditions modified for i cc1 and v ol in table 11: dc characteristics (m34c02-w) . device internal reset removed and replaced by section 2.6: supply voltage (v cc ) . blank option removed below plating technology in ta bl e 1 3 . 05-jun-2007 10 m34c02-w and m34c02-l part numbers removed. device grade 1 temperature range removed. section 2.5: v ss ground added. i cc conditions modified in table 9: dc characteristics . table 11: ufdfpn8 (mlp8) 8-lead ultra thin fine pitch dual flat package no lead 2 x 3 mm, package mechanical data updated. 25-mar-2009 11 section 3.6: setting the software write-protection modified. ecopack text and udfdfpn8 package specifications updated in section 8: package mechanical data . small text changes.
m34c02-r 29/29 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2009 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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