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CAT9554A

Catalyst Semiconductor
Part Number CAT9554A
Manufacturer Catalyst Semiconductor
Description 8-Bit I2C and SMBus I/O Port
Published Nov 21, 2006
Detailed Description www.DataSheet4U.com CAT9554, CAT9554A 8-bit I2C and SMBus I/O Port with Interrupt FEATURES I 400kHz I2C bus compatible*...
Datasheet PDF File CAT9554A PDF File

CAT9554A
CAT9554A

Overview
www.
DataSheet4U.
com 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 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 device’s 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.
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) For Ordering Information details, see page 15.
BLOCK DIAGRAM A0 A1 A2 8-BIT SCL SDA INPUT FILTER I2C/SMBUS CONTROL WRITE pulse READ ...


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