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||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||| 2 channel i2c bus switch with interrupt logic and reset 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 1 pi4 msd5v95 4 3 a features ? 1 - of - 2 bidirectional translating multiplexer ? i2c - bus interface logic ? operating power supply voltage : 1.65 v to 5.5 v ? allows voltage level translation between 1.2v, 1.8v,2 .5 v, 3.3 v and 5 v buses ? low standby current ? low ron switches ? channel selecti on via i2c bus ? power - up with all multiplexer channels deselected ? capacit ance isolat i on when channel disabled ? no glitch on power - up ? supports hot insertion ? 5 v tolerant inputs ? 0 hz to 400 khz clock frequency ? esd protection exceeds 8 000 v hbm per jesd22 - a11 4, and 1000 v cdm per jesd22 - c101 ? latch - up testing is done to jedec standard jesd78 which exceeds 100 ma ? packages offered: so ic - 14 w ,tssop - 14 l description the pi4msd5v9543a is a bidirectional translating switch, controlled by the i2c bus. the scl/sda cha nnels. any individual scx/sdx channels or combination of channels can be selected, determined by pin configuration contents of the programmable control register. two upstream pair fans out to two downstream pairs, or the interrupt inputs, int0 and int1, one for each of the downstream pairs, are provided. one interrupt output, int, which acts as an and of the two interrupt inputs, is provided. an active low reset input allows the pi4msd5v9543a to recover from a situation where one of the downstre am buses is stuck in a low state. pulling the reset pin low resets the i2c bus state machine and causes all the channels to be deselected, as does the internal power - on reset function. the pass gates of the switches are constructed such that the vcc pin ca n be used to limit the maximum high voltage which will be passed by the pi4msd5v9543a . this allows the use of different bus voltages on each scx/sdx pair, so that 1.2v, 1.8 v, 2.5 v, or 3.3 v parts can communicate with 5 v parts without any additional prote ction. external pull - up resistors pull the bus up to the desired voltage level for each channel. all i/o pins are 5 v tolerant. pin description pin no pin name type description 1 a 0 input address input 0 2 a 1 input address input 1 3 input active l ow reset input 4 i nput active low interrupt input 0 5 sd0 i/o serial data 0 6 sc0 i/o serial clock 0 7 gnd ground supply ground 8 input active low interrupt input 1 9 sd1 i/o serial data 1 10 sc1 i/o serial clock 1 11 output active low interr upt output 12 scl i/o s erial clock line 13 sda i/o serial data line 14 vcc power supply voltage tssop14 sop14 int0 int 1 int reset
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 2 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset block diagram figure 1: block diagram maximum ratings storage temperature .............. .......................... ......... C 5 5c to +1 25 c supply voltage port b ...... ......................................... .. C 0.5v to + 6.0 v supply voltage port a ........ ........................................ C 0.5v to + 6.0 v dc input voltage ......................... .............................. C 0.5v to +6 .0 v cont rol input voltage (en ) ...... ..................... ....... C 0.5v to +6 .0 v t otal power dissipation (1) ............. ...................................... .... 100mw i nput current (en,vcca,vccb,gnd) .............. ................... .... 50ma esd: hbm mode ...... ....... ................................................. ....... 8000v recommended operation conditions symbol parameter min typ max unit v cc v cca positive dc supply voltage 1.65 - 5.5 v v en enable control pin voltage gnd - 5.5 v v io i/o pin voltage gn d - 5.5 v t /v input transition rise or fall time - - 10 ns/v t a operating temperature range ? 40 - +85 c note: stresses greater than those listed under maximum ratings m ay cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other condi - tions above those indicated in the operational sec - tions of this specification is not implied. exposure to absolute max imum rating conditions for extended periods may affect reliability.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 3 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset dc electrical characteristics unless otherwise specified, - 40ct a 8 5c , 1. 1 v vcc 3.6 v symbol parameter conditions vcc min typ max unit supply vcc s upply voltage 1.65 5.5 v icc supply current operating mode; no load; v i = vcc or gnd ; fscl = 100 khz 3.6v to 5.5v 65 100 ua 2.3v to 3.6v 20 50 ua 1.65v to 2.3v 10 30 ua istb standby current standby mode; vcc = 3.6 v; no load; v i = vcc or gnd; fscl = 0 khz 3.6v to 5.5v 0.3 1 ua 2.3v to 3.6v 0.1 1 ua 1.65v to 2.3v 0.1 1 ua vpor [1] power - on reset voltage no load; v i = vcc or gnd 3.6v to 5.5v 1.3 1.5 v input scl; input/output sda v il low - level input voltage 1.65v to 5 .5v - 0.5 +0.3 v cc v v ih high - level input voltage 1.65v to 2v 0.75 v cc 6 v 2v to 5.5v 0.7 v cc 6 v i ol low - level output current v ol = 0.4 v 1.65v to 5.5v 3 - ma v ol = 0.6 v 1.65v to 5.5v 6 - ma i il low - level input current v i = gnd 1.65v to 5 .5v - 1 +1 ua i ih high - level input current v i = vcc 1.65v to 5.5v - 1 +1 ua ci input capacitance vi = gnd 3.6v to 5.5v - 9 10 pf pass gate ron on - state resistance v o = 0.4 v; i o = 15 ma 4.5 v to 5.5 v 4 9 24 o = 0.4 v; i o = 1 0 ma 2.3v to 2.7v 7 16 55 l leakage current vi = vcc or gnd 1.65v to 5.5v - 1 +1 ua cio input/output capacitance vi = vcc or gnd 1.65v to 5.5v 3 5 pf to be continued
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 4 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset continue d symbol parameter conditions vcc min typ max unit select inputs a0, a1 , int0, int1 v il low - level input voltage 1.65v to 5.5v - 0.5 +0.3 v cc v v ih high - level input voltage 1.65v to 5.5v 0.7 v cc 6 v i il low - level input current v i = gnd 1.65v to 5.5v - 1 +1 ua ci input capacitance v i = gnd 1.65 v to 5.5v 3 5 pf int output i o l low - level out put current v ol = 0.4 v 1.65v to 5.5v 3 ma i o h high - level out put current 1.65v to 5.5v +10 ua note : vcc must be lowered to 0.2 v for at least 5 u s in order to reset part. ac electrical characteristics tamb = - 40 o c to +85 o c; unless otherwise specified. symbol parameter conditions vcc min typ max unit t pd [1] propagation delay f rom sda to sdx, or scl to scx 1.65v to 5.5v 0.3 ns int [2] t v _int valid time from intn to int signal 1.65v to 5.5v 4 us t d _int delay time from intn to int inactive 1.65v to 5.5v 2 us t rej_l low - level rejection time 1.65v to 5.5v 1 us t rej_ h high - level rejection time 1.65v to 5.5v 0.5 us reset t w(rst)l l ow - level reset time 4 ns t rst reset time sda clear 500 ns t rec;sta recovery time to start condition 0 ns note [1] pass gate propagation delay is calculated from the 20 typical ron and the 15 pf load capacitance. [2] measurements taken with 1 kpull - up resistor and 50 pf load.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 5 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset i2c interface timing requirements symbol parameter standard mode i 2 c bus fast mode i 2 c bus unit min max min max fscl i2c clock frequenc y 0 100 0 400 khz t low i2c clock high time 4.7 1.3 s high i2c clock low time 4 0.6 s sp i2c spike time 50 50 ns t su:dat i2c serial - data setup time 250 100 ns t hd :dat i2c serial - data hold time 0 [1] 0 [1] s buf i2c bus free time between stop and start 4.7 1.3 s su:sta i2c start or repeated start condition setup 4.7 0.6 s hd:sta i2c start or repeated start condition hold 4 0.6 s su:sto i2c stop co ndition setup 4 0.6 s vd:dat valid - data time (high to low) [ 2 ] scl low to sda output low valid 1 1 s [ 2 ] scl low to sda output high valid 0.6 0.6 s vd:ack valid - data time of ack condition ack signal from scl lo w to sda output low 1 1 s notes: [1] a device internally must provide a hold time of at least 300 ns for the sda signal (referred to as the vih min of the scl signal), in order to bridge the undefined re gion of the falling edge of scl. [ 2 ] data taken using a 1 - k? pull up resistor and 50 - pf load notes figure 2 . definition of timing on the i2c - bus
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 6 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset application figure 3 . typical application vcc vpu1 vpu2 1.8v 1. 5 v - 5.5v 1.2v - 5.5v 2.5v 1.8 v - 5.5v 1.8v - 5.5v 3.3v 2.7v - 5.5v 2.7v - 5.5v 5v 4.5v - 5.5v 4.5v - 5.5v note: if the device generating the interrupt has an open - drain output structure or can be 3 - stated, a pull - up resistor is required. if the device generating the interrupt has a totem pole output structure and cannot be 3 - stated, a pull - up resistor is not required. the interrupt inputs should not be left floating. device addressing following a start condition the bus master must output the address of the slave it is accessing. the addr ess of the pi4msd5v9543a is shown in figure 4 . to conserve power, no internal pull - up resistors are incorporated on the hardw are selectable address pins and they must be pulled high or low. the last bit of the slave address defines the operation to be per formed. when set to logic 1 a read is selected, while a logic 0 selects a write operation. i2c bus master
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 7 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset figure 4 : device address control register following the successful acknowledgement of the slave address, the bus master will send a byte to the pi4msd5v9543a , which will be stored in the control register. if multiple bytes are received by the pi4msd5v9543a , it will save the last byte received. this register can be written and read via the i2c - bus. figure 5 : control register control register definition one o r several scx/sdx downstream pair, or channel, is selected by the contents of the control register. this register is written after the pi4msd5v9543a has been addressed. the 2 lsbs of the control byte are used to determine which channel is to be selected. w hen a channel is selected, the channel will become active after a stop condition has been placed on the i2c - bus. this ensures that all scx/sdx lines will be in a high state when t he channel is made active, so that no false conditions are generated at the t ime of connection. bits int0, int1, d6 and d7 are all writable, but will read the chip status. int0 and int1 indicate the state of the corresponding interrupt input. d7 and d6 always read 0. d7 d6 int1 int0 d3 b2 b1 b0 command x x x x x x x 0 channel 0 d is abled 1 channel 0 enabled x x x x x x 0 x channel 1 dis abled 1 channel 1 enabled 0 0 0 0 0 0 0 0 no channel selected; power - up/reset default state control register: write channel selection; read channel status. remark: channel 0 and c hannel 1 can be enabled at the same time. care should be taken not to exceed the maximum bus capacitance.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 8 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset interrupt handling the pi4msd5v9543a provides 2 interrupt inputs, one for each channel, and one open - drain interrupt output. when an interrupt is ge ner ated by any device, it will be detected by the pi4msd5v9543a and the interrupt output w ill be driven low. the channel need not be active for detection of the interrupt. a bit is also set in the control register. bit 4 and bit 5 of the control register c orresponds to the int0 and int1 inputs of the pi4msd5v9543a , respectively. therefore, if an interrupt is generated by any device connected to channel 1, the state of the interrupt inputs is loaded into the control register when a read is accomplished. like wise, an interrupt on any device connected to channel 0 would cause bit 4 of the control register to be set on the read. the master can then address the pi4msd5v9543a and read the contents of the control register to determine which channel contains the dev ice generating the interrupt. the master can then reconfigure the pi4msd5v9543a to select this channel, and locate the device generating the interrupt and clear it. it should be noted that more than one device can provide an interrupt on a channel, so it i s up to the master to ensure that all devices on a channel are interrogated for an interrupt.the interrupt inputs may be used as general - purpose inputs if the interrupt function is not required. if unused, interrupt input s must be connected to vcc through a pull - up resistor. d7 d6 int1 int0 d3 d 2 b1 b0 command 0 0 x 0 x x x x no interrupt on channel 0 1 interrupt on channel 0 0 0 0 x x x x x no interrupt on channel 1 1 interrupt on channel 1 control register read interrupt the r eset pin the reset input is an active low signal which may be used to recover from a bus fault condition. by asserting this signal low for a minimum of tw(rst)l, the pi4msd5v9543a will reset its registers and i2c - bus state machine and will deselect all channel s. the reset input must be connected to vcc through a pull - up resistor. power - on reset when power is applied to vcc , an internal power - on reset (por) holds the pi4msd5v9543a in a reset condition until vcc has reached vpor. at this point, the reset conditi on is released and the pi4msd5v9543a registers and i2c - bus state machine are initialized to their default states (all zeroes), causing all the channels to be deselected. thereafter, vcc must be lowered below 0.2 v for at least 5 u s in order to reset the de vice.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 9 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset voltage translation the pass gate transistors of the pi4msd5v9543a are constructe d such that the vcc voltage can be used to limit the maximum voltage that is passed from one i2c - bus to another. figure 6 : vpass voltage vs vcc figure 6 shows th e voltage characteristics of the pass gate transistors (note that the graph was generated using the data specified in section dc electrical characteristics of this data sheet). in order for the pi4msd5v9543a to act as a voltage translator, the v pass vo ltage should be equal to, or lower than the lowest bus voltage. fo r example, if the main bus was running at 5 v, and the downstream buses were 3.3 v and 2.7 v, then v pass should be equal to or below 2.7 v to clamp the downstream bus voltages effectively. looking at figure 6 , we see that v pass (max) is at 2.7 v when the pi4msd5v9543a supply voltage is 3.5 v or lower so the pi4msd5v9543a supply voltage could be set to 3.3 v. pull - up resistors can then be used to bring the bus voltages to their appropriate levels i2c bus the i2c - bus is for 2 - way, 2 - line communication between dif ferent ics or modules. the two lines are a serial data line (sda) and a serial clock line (scl). both lines must be connected to a positive supply via a pull - up resistor when connec ted to the output stages of a device. data transfer may be initiated only when the bus is not busy. one data bit is transferred during each clock pulse. the data on the sda line must remain stable during the high period of the clock pulse as changes in the data line at this time are interpreted as control signals figure 7 : bit transfer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 10 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset both data and clock lines remain high when the bus is not busy. a high - to - low transition of the data line while the clock is high is defined as the start condition ( s). a low - to - high transition of the data line while the clock is high is defined as the stop condition (p) figure 8 . definition of start and stop conditions a device generating a message is a transmitter, a device receiving is the receiver. the dev ice that controls the message is the master and the devices which are controlled by the master are the slaves figure 9 . system configuration the number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. each byte of 8 bits is followed by one acknowledge bit. the acknowledge bit is a high level put on the bus by the transmitter, whereas the master generates an extra acknowledge related clock pulse. a slave receiver which is addressed must generate an acknowledge after the reception of each byte. also, a master must generate an acknowledge after the reception of each byte t hat has been clocked out of the slave transmitter. the device that acknowledges has to pull down the sda line during th e acknowledge clock pulse so that the sda line is stable low during the high period of the acknowledge relat ed clock pulse; set - up and hold times must be taken into account.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 11 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset a master receiver must signal an end of data to the transmitter by not generatin g an acknowledge on the last byte that has been clocked out of the slave. in this event, the transmitter must leave the data line high to enabl e the master to generate a stop condition. figure 10 . acknowledgment on i2c bus data is transmitted to the p i4msd5v9543a control regist er using the write mode shown in bellow figure 11 . write control register data is transmitted to the pi4msd5v9543a control register using the write mode shown in bellow figure 12 . read control register
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||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2 0 1 5 - 0 7 - 0 0 3 4 pt0 5 24 - 4 8 / 1 8 /1 5 13 pi4 msd5v954 3 a 2 channel i2c bus switch w ith i nterrupt logic and reset mechanical information tssop - 14 ( l ) ordering information part no. package code package pi4msd5v9543 a w e w 14 - pin,150 mil wide soic pi4msd5v9543aw ex w 14 - pin,150 mil wide soic , tape & reel pi4msd5v9543al e l 14 - pin,173 mil wide tssop pi4msd5v9543al ex l 14 - pin,173 mil wide tssop , tape & reel note: ? e = pb - free and green ? adding x suffix = tape /r eel pericom semiconductor corporation ? 1 - 800 - 435 - 2336 ? www.pericom.com peri com reserves the right to make changes to its products or specifications at any time, without notice, in order to improve des ign or performance and to supply the best possible product. pericom does not assume any responsibility for use of any circuitry des cribed other than the circuitry embodied in pericom product. the company makes no representations that circuitry described herein is free from patent infringement or other rights, of pericom .

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