Philips Semiconductors

Product specification

PCA9542

2

1999 Oct 07

853–2177 22486

FEATURES

DESCRIPTION

The PCA9542 is a 1-of-2 bi-directional translating multiplexer,

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, one for each of

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

which acts as an AND of the two 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 PCA9542. 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

1

2

3

4

5

6

78

9

10

11

12

13

14

A0

A1

A2

INT0

SD0

SC0

SDA

SCL

SD1

SC1

INT1

INT

SW00475

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

Supply ground

8

INT1

Interrupt input 1

9

SD1

Serial data 1

10

SC1

Serial clock 1

11

INT

Interrupt output

12

SCL

Serial clock line

13

SDA

Serial data line

14

Supply voltage

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

14-Pin Plastic TSSOP

0

°C to +70°C

PCA9542PW DH

SOT402-1