Philips Semiconductors

Product specification

PCA9544

2

1999 Oct 07

853–2178 22487

FEATURES

DESCRIPTION

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

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.

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.

PIN CONFIGURATION

A0

A1

A2

INT0

SD1

SDA

SCL

1

20

2

19

3

18

4

17

5

16

6

15

7

14

8

13

SD0

SC0

INT1

INT

SC3

SD3

INT3

SC2

9

12

10

11

SC1

VSS

SD2

INT2

SW00373

PIN DESCRIPTION

PIN

NUMBER

SYMBOL

FUNCTION

1

A0

Address input 0

2

A1

Address input 1

3

A2

Address input 2

4

INT0

Interrupt input 0

5

SD0

Serial data 0

6

SC0

Serial clock 0

7

INT1

Interrupt input 1

8

SD1

Serial data 1

9

SC1

Serial clock 1

10

VSS

Supply ground

11

INT2

Interrupt input 2

12

SD2

Serial data 2

13

SC2

Serial clock 2

14

INT3

Interrupt input 3

15

SD3

Serial data 3

16

SC3

Serial clock 3

17

INT

Interrupt output

18

SCL

Serial clock line

19

SDA

Serial data line

20

Supply voltage

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

20-Pin Plastic TSSOP

0

°C to +70°C

PCA9544 PW DH

SOT360-1