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Philips Semiconductors

Product data sheet

PCA9546

4-channel I2C switch with reset

2004 Sep 30

FEATURES

• 1-of-4 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 Rds

ON 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: SO16, TSSOP16

DESCRIPTION

The PCA9546 is a quad bi-directional translating switch controlled

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

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 PCA9546 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 PCA9546. 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

16-Pin Plastic SO

–40

°C to +85 °C

PCA9546D

SOT109-1

16-Pin Plastic TSSOP

–40

°C to +85 °C

PCA9546PW

SOT403-1

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

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