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PCA9540B

2-channel I2C multiplexer

Philips Electronics 

Philips Semiconductors

2-channel I2C multiplexer

Product data sheet

PCA9540B

FEATURES

• 1-of-2 bi-directional translating multiplexer

• I2C interface logic; compatible with SMBus standards

• Channel selection via I2C-bus

• Power up with all multiplexer channels deselected

• Low RdsON switches

• Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and

5 V buses

• No glitch on power-up

• Supports hot insertion

• Low stand-by current

• Operating power supply voltage range of 2.3 V to 5.5 V

• 5 V tolerant Inputs

• 0 to 400 kHz clock frequency

• ESD protection exceeds 2000 V HBM per JESD22-A114,

200 V MM per JESD22-A115 and 1000 V per JESD22-C101

• Latch-up testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

• Packages Offered: SO8, TSSOP8

DESCRIPTION

The PCA9540B 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.

A power-on reset function puts the registers in their default state and

initializes the I2C state machine with no channels selected.

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 PCA9540B. This allows the use of different bus

voltages on each SCx/SDx pair, so that 1.8 V, 2.5, or 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. All I/O pins are 5 V tolerant.

The PCA9540B has replaced the PCA9540 and all designs must

migrate to the PCA9540B. PCA9540B samples can be requested

from www.philipslogic.com/products/I2Cmuxes/.

PIN CONFIGURATION

SCL 1

SDA 2

VDD 3

SD0 4

8 SC1

7 SD1

6 VSS

5 SC0

SW00491

Figure 1. Pin configuration

PIN DESCRIPTION

PIN

NUMBER

SYMBOL

1

SCL

2

SDA

3

VDD

4

SD0

5

SC0

6

VSS

7

SD1

8

SC1

FUNCTION

Serial clock line

Serial data line

Supply voltage

Serial data 0

Serial clock 0

Supply ground

Serial data 1

Serial clock 1

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

TOPSIDE MARK

DRAWING NUMBER

8-Pin Plastic SO

–40 °C to +85 °C

PCA9540BD

PA9540B

SOT96-1

8-Pin Plastic TSSOP

–40 °C to +85 °C

PCA9540BDP

9540B

Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.

SOT505-1

2004 Sep 29

2

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