PCA9545 datasheet(2/14 Pages) PHILIPS

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Philips Semiconductors

Product data

PCA9545

4-channel I2C switch with interrupt logic and reset

2002 Mar 28

853-2302 27940

FEATURES

• 1-of-4 bi-directional translating switches

• I2C interface logic; compatible with SMBus standards

• 4 active low interrupt inputs

• Active low interrupt output

• Active low reset input

• 2 address pins allowing up to 4 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 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

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

exceeds 100 mA

• Package Offer: SO20, TSSOP20

DESCRIPTION

The PCA9545 is a quad bi-directional translating switch controlled

via 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. Four interrupt inputs,

INT0 to INT3, one for each of the downstream pairs, are provided.

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

inputs.

An active-LOW reset input allows the PCA9545 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 PCA9545. This allows the use of different bus

voltages on each pair, so that 1.8 V or 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.

PIN CONFIGURATION

RESET

INT0

SD1

VDD

SDA

SCL

SD0

SC0

INT1

INT

SC3

SD3

INT3

SC2

SC1

VSS

SD2

INT2

SW00762

Figure 1. Pin configuration

PIN DESCRIPTION

NUMBER

SYMBOL

FUNCTION

Address input 0

Address input 1

RESET

Active low reset input

INT0

Active low interrupt input 0

SD0

Serial data 0

SC0

Serial clock 0

INT1

Active low interrupt input 1

SD1

Serial data 1

SC1

Serial clock 1

VSS

Supply ground

INT2

Active low interrupt input 2

SD2

Serial data 2

SC2

Serial clock 2

INT3

Active low interrupt input 3

SD3

Serial data 3

SC3

Serial clock 3

INT

Active low interrupt output

SCL

Serial clock line

SDA

Serial data line

VDD

Supply voltage

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

20-Pin Plastic SO

–40 to +85

°C

PCA9545D

SOT163-1

20-Pin Plastic TSSOP

–40 to +85

°C

PCA9545PW

SOT360-1

Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.

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