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PCA9544A

4-channel I2C multiplexer with interrupt logic

Philips Electronics 

Philips Semiconductors

4-channel I2C multiplexer with interrupt logic

Product data sheet

PCA9544A

FEATURES

• 1-of-4 bi-directional translating multiplexer

• I2C interface logic; compatible with SMBus

• 4 Active-LOW Interrupt Inputs

• Active-LOW Interrupt Output

• 3 address pins allowing up to 8 devices on the I2C-bus

• 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

• Latchup testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

• Three packages offered: SO20, TSSOP20, and HVQFN20

DESCRIPTION

The PCA9544A is a 1-of-4 bi-directional translating multiplexer,

controlled via the I2C-bus. The SCL/SDA upstream pair fans out to

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, INT0 to INT3,

one for each of the SCx/SDx downstream pairs, are provided. One

interrupt output, INT, which acts as an AND of the four interrupt

inputs, is provided.

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 PCA9544A. This allows the use of different bus

voltages on each SCx/SDx pair, so that 1.8 V, 2.5 V or 3.3 V parts

can communicate with 5 V parts without any additional protection.

External pull-up resistors pull the bus up to the desired voltage level

for each channel. All I/O pins are 5 V tolerant.

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

TOPSIDE MARK

DRAWING NUMBER

20-Pin Plastic SO

–40 °C to +85 °C

PCA9544AD

PCA9544AD

20-Pin Plastic TSSOP

–40 °C to +85 °C

PCA9544APW

PA9544A

20-Pin Plastic HVQFN

–40 °C to +85 °C

PCA9544ABS

9544A

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

I2C is a trademark of Philips Semiconductors Corporation.

SOT163-1

SOT360-1

SOT662-1

2004 Sep 29

2

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