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PCA9544

4-channel I²C multiplexer and interrupt controller

Philips Electronics 

Philips Semiconductors

4-channel I2C multiplexer and interrupt controller

Product specification

PCA9544

FEATURES

• 1-of-4 bi-directional translating multiplexer

• Channel selection via I2C bus

• Operating supply voltage 2.5 to 3.6 V

• Operating temperature range 0°C to 70°C

• Power-up with all multiplexer channels deselected

• 3 address pins, allowing up to 8 devices on the I2C bus

• Low on resistance

DESCRIPTION

The PCA9544 is a 1-of-4 bi-directional translating multiplexer,

controlled via the I2C bus. The SCL/SDA upstream pair fans out to

four 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. Four interrupt inputs, one for each of

the SCx/SDx downstream pair, are provided. One interrupt output,

which acts as an AND of the four interrupt inputs, is provided. All I/O

pins are 5 V tolerant.

The pass gates of the multiplexer are constructed such that the VDD

pin can be used to limit the maximum high voltage which will be

passed by the PCA9544. This allows the use of different bus

voltages on each SCx/SDx pair, so that 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.

ORDERING INFORMATION

PACKAGES

20-Pin Plastic TSSOP

TEMPERATURE RANGE

0°C to +70°C

PIN CONFIGURATION

A0 1

A1 2

A2 3

INT0 4

SD0 5

SC0 6

INT1 7

SD1 8

SC1 9

VSS 10

PIN DESCRIPTION

PIN

NUMBER

SYMBOL

1

A0

2

A1

3

A2

4

INT0

5

SD0

6

SC0

7

INT1

8

SD1

9

SC1

10

VSS

11

INT2

12

SD2

13

SC2

14

INT3

15

SD3

16

SC3

17

INT

18

SCL

19

SDA

20

VDD

20 VDD

19 SDA

18 SCL

17 INT

16 SC3

15 SD3

14 INT3

13 SC2

12 SD2

11 INT2

SW00373

FUNCTION

Address input 0

Address input 1

Address input 2

Interrupt input 0

Serial data 0

Serial clock 0

Interrupt input 1

Serial data 1

Serial clock 1

Supply ground

Interrupt input 2

Serial data 2

Serial clock 2

Interrupt input 3

Serial data 3

Serial clock 3

Interrupt output

Serial clock line

Serial data line

Supply voltage

ORDER CODE

PCA9544 PW DH

DRAWING NUMBER

SOT360-1

1999 Oct 07

2

853–2178 22487

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