Philips Semiconductors

Product data sheet

PCA9540B

2

2004 Sep 29

FEATURES

5 V buses

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

exceeds 100 mA

DESCRIPTION

The PCA9540B 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.

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

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

1

2

3

45

6

7

8

SCL

SDA

SD0

SC1

SD1

SC0

SW00491

Figure 1. Pin configuration

PIN DESCRIPTION

PIN

NUMBER

SYMBOL

FUNCTION

1

SCL

Serial clock line

2

SDA

Serial data line

3

Supply voltage

4

SD0

Serial data 0

5

SC0

Serial clock 0

6

Supply ground

7

SD1

Serial data 1

8

SC1

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

SOT505-1

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