CAT9554A Datasheet, PDF(1/16 Page) Catalyst Semiconductor – 8-bit I2C and SMBus I/O Port with Interrupt

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CAT9554A Datasheet, PDF (1/16 Pages) Catalyst Semiconductor – 8-bit I2C and SMBus I/O Port with Interrupt

CAT9554, CAT9554A

8-bit I2C and SMBus I/O Port with Interrupt

FEATURES

I 400kHz I2C bus compatible*

I 2.3V to 5.5V operation

I Low stand-by current

I 5V tolerant I/Os

I 8 I/O pins that default to inputs at power-up

I High drive capability

I Individual I/O configuration

I Polarity inversion register

I Active low interrupt output

I Internal power-on reset

I No glitch on power-up

I Noise filter on SDA/SCL inputs

I Cascadable up to 8 devices

I Industrial temperature range

I RoHS-compliant 16-lead SOIC and TSSOP, and

16-pad TQFN (4 x 4 mm) packages

APPLICATIONS

I White goods (dishwashers, washing machines)

I Handheld devices (cell phones, PDAs, digital

cameras)

I Data Communications (routers, hubs and

servers)

DESCRIPTION

The CAT9554 and CAT9554A are CMOS devices that

provide 8-bit parallel input/output port expansion for I2C

and SMBus compatible applications. These I/O

expanders provide a simple solution in applications

where additional I/Os are needed: sensors, power

switches, LEDs, pushbuttons, and fans.

The CAT9554/9554A consist of an input port register, an

output port register, a configuration register, a polarity

inversion register and an I2C/SMBus-compatible serial

interface.

Any of the eight I/Os can be configured as an input or

output by writing to the configuration register. The system

master can invert the CAT9554/9554A input data by

writing to the active-high polarity inversion register.

The CAT9554/9554A features an active low interrupt

output which indicates to the system master that an input

state has changed.

The deviceâs extended addressing capability allows up

to 8 devices to share the same bus. The CAT9554A is

identical to the CAT9554 except the fixed part of the I2C

slave address is different. This allows up to 16 of devices

(eight CAT9554 and eight CAT9554A) to be connected

on the same bus.

For Ordering Information details, see page 15.

BLOCK DIAGRAM

SCL

SDA

INPUT

FILTER

I2C/SMBUS

CONTROL

8-BIT

WRITE pulse

READ pulse

INPUT/

OUTPUT

PORTS

VCC

VSS

POWER-ON

RESET

NOTE: ALL I/Os ARE SET TO INPUTS AT RESET

* Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol.

Characteristics subject to change without notice

FILTER

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7 VCC

INT

Doc. No. 25088, Rev. B

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