The CAT9554YI-G-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 CAT9554YI-G-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 CAT9554YI-G-T2 input data by writing to the active-high polarity inversion register. The CAT9554YI-G-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 CAT9554YI-G-T2 except the fixed part of the I²C slave address is different. This allows up to 16 of devices (eight CAT9554YI-G-T2 and eight CAT9554A) to be connected on the same bus.
Feature
- 400 kHz I2C Bus Compatible
- 2.3 V to 5.5 V Operation
- Low Standby Current
- 5.0 V Tolerant I/Os
- 8 I/O Pins that Default to Inputs at Power-up
- High Drive Capability
- Individual I/O Configuration
- Polarity Inversion Register
- Active Low Interrupt Output
- Internal Power-on Reset
- No Glitch on Power-up
- Noise Filter on SDA/SCL Inputs
- Cascadable Up to 8 Devices
- Industrial Temperature Range
Applications
- Input/output Port Expansion for Extended Addressing Capability
- White Goods (Dishwashers, Washing Machines)
- Handheld Devices (Cell Phones, PDAs, Digital Cameras)
- Data Communications (Routers, Hubs and Servers)
(Picture: Pinout)
