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I/O Expanders

Catalyst Semiconductor offers a wide variety of I²C/SMBus I/O Port Expanders which provide additional I/Os for ACPI power switches, servers, sensors, fans, LEDs, and industrial control applications. This product line is categorized into two sections: Simple I/O Expanders and LED Blinkers.

All Catalyst I²C/SMBus I/O Port Expanders operate from 2.3V to 5.5V of supply voltage; 0Hz to 400kHz clock frequency; and are a second source for Philips Bus Expanders.

I/O Expanders
Part No.	Description
CAT9554	8-bit I²C and SMBus I/O Port with Interrupt
CAT9554A	8-bit I²C and SMBus I/O Port with Interrupt
CAT9555	16-bit I²C and SMBus I/O Port with Interrupt
CAT9532	16-bit Programmable LED Dimmer with I²C Interface