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2 Channel I2C bus Multiplexer

2015-07-0032

PT0522-4

08/18/15

1

PI4MSD5V9540B

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 selection via I2C bus

 Power-up with all multiplexer channels deselected

 Capacitance isolation 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 8000 V HBM per JESD22-

A114, and 1000 V CDM per JESD22-C101

 Latch-up testing is done to JEDEC Standard

JESD78 which exceeds 100 mA

 Packages offered: SOIC-8W,MSOP-

8U,TDFN2x3-8ZE

Pin Configuration

Description

The PI4MSD5V9540B is a 1-of-2 bidirectional

translating multiplexer, controlled via the I2C bus

The SCL/SDA upstream pair fans out to two

SCx/SDx downstream pairs, or channels. Only one

SCx/SDx channel is selected at a time, determined

by the contents of the programmable control register.

A power-on reset function puts the registers in their

default state and initializes the I2C bus state machine

with no channels selected.

The pass gates of the multiplexer are constructed

such that the VCC pin can be used to limit the maximum

high voltage that is passed by the PI4MSD5V9540B.

This allows the use of different bus voltages on each

SCx/SDx pair, so that1.2V, 1.8 V, 2.5 V or 3.3 V parts

can communicate with 5 V parts without any additional

protection. External pull-up resistors can pull the bus up

to the desired voltage level for this channel. All I/O pins

are 5 V tolerant.

Pin Description

Pin No

Pin Name

Type

Description

1

SCL

I/O

serial clock line

2

SDA

I/O

serial data line

3

VCC

Power

supply voltage

4

SD0

I/O

serial data 0

5

SC0

I/O

serial clock 0

6

GND

GND

supply ground

7

SD1

I/O

serial data 1

8

SC1

I/O

serial clock 1

MSOP

SOIC

TDFN