ON CAT9554AYGI-T2

8I²C, SMBusPOR2,3 В ~ 5,5 В-40°C ~ 85°C

Overview

The CAT9554AHV4I-T2 is a CMOS device that provides 8-bit parallel input/output port expansion for I²C and SMBus compatible applications. This I/O expander provides a simple solution in applications where additional I/Os are needed: sensors, power switches, LEDs, pushbuttons, and fans. The CAT9554AHV4I-T2 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 CAT9554AHV4I-T2 input data by writing to the active-high polarity inversion register. The CAT9554AHV4I-T2 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 CAT9554AHV4I-T2 except the fixed part of the I²C slave address is different. This allows up to 16 of devices (eight CAT9554AHV4I-T2 and eight CAT9554A) to be connected on the same bus.

Features