PCA9540 datasheet(2/10 Pages) PHILIPS

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Philips Semiconductors

Product specification

PCA9540

2-channel I2C multiplexer

1999 Dec 15

853–2185 22852

FEATURES

• 1-of-2 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

• Low on resistance

DESCRIPTION

The PCA9540 is a 1-of-2 bi-directional 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.

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 PCA9540. 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

SCL

SDA

VDD

SD0

SC1

SD1

SC0

VSS

SW00491

PIN DESCRIPTION

NUMBER

SYMBOL

FUNCTION

SCL

Serial clock line

SDA

Serial data line

VDD

Supply voltage

SD0

Serial data 0

SC0

Serial clock 0

VSS

Supply ground

SD1

Serial data 1

SC1

Serial clock 1

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

8-Pin Plastic SO

°C to +70°C

PCA9540D

SOT96-1

8-Pin Plastic TSSOP

°C to +70°C

PCA9540PW DH

SOT505-1

PCA9540 Datasheet(PDF) 2 Page - NXP Semiconductors

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