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2 Channel I2Cbus Multiplexer with interrupt logic

2015-07-0033

PT0523-4

8/18/15

1

PI4MSD5V9542A

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-14W,TSSOP-14L

Pin Configuration

Description

The PI4MSD5V9542A 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. Two interrupt inputs, INT0 and INT1, one for

each of the SCx/SDx downstream pairs, are provided.

One interrupt output, INT, which acts as an AND of the

two interrupt inputs, is provided.

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 which will be passed by the

PI4MSD5V9542A. 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 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

A0

Input

address input 0

2

A1

Input

address input 1

3

A2

Input

address input 2

4

Input

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 interrupt output

12

SCL

I/O

serial clock line

13

SDA

I/O

serial data line

14

VCC

Power

supply voltage

TSSOP

SOIC

INT0

INT1

INT