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PCA9548

8-channel I2C switch with reset

Philips Electronics 

Philips Semiconductors

8-channel I2C switch with reset

Product data sheet

PCA9548

FEATURES

• 1-of-8 bi-directional translating switches

• I2C interface logic; compatible with SMBus standards

• Active LOW Reset Input

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

• Channel selection via I2C-bus, in any combination

• Power-up with all switch 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 kHz to 400 kHz clock frequency

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

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

• Latchup testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

• Packages offered: SO24, TSSOP24

DESCRIPTION

The PCA9548 is a octal bi-directional translating switch controlled

by the I2C-bus. The SCL/SDA upstream pair fans out to eight

downstream pairs, or channels. Any individual SCx/SDx channel or

combination of channels can be selected, determined by the

contents of the programmable Control Register.

An active-LOW reset input allows the PCA9548 to recover from a

situation where one of the downstream I2C-buses is stuck in a LOW

state. Pulling the RESET pin LOW resets the I2C state machine and

causes all the channels to be deselected as does the internal power

on reset function.

The pass gates of the switches are constructed such that the VDD

pin can be used to limit the maximum high voltage which will be

passed by the PCA9548. This allows the use of different bus

voltages on each 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

DRAWING NUMBER

24-Pin Plastic SO

–40 °C to +85 °C

PCA9548D

SOT137-1

24-Pin Plastic TSSOP

–40 °C to +85 °C

PCA9548PW

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

SOT355-1

2004 Sep 30

2

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