CAT9534

www.DataSheet4U.com CAT9534 8-bit I²C and SMBus I/O Port with Interrupt FEATURES  400kHz I²C bus compatible  2.3V to 5.5V operation  Low stand-by current  5V 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  RoHS-compliant 16-lead SOIC and TSSOP, and 16-pad TQFN (4 x 4mm) packages DESCRIPTION The CAT9534 is an 8-bit parallel input/output port expander 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 CAT9534 consists 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 CAT9534 input data by writing to the active-high polarity inversion register. The CAT9534 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. CAT9534 is offered in 16 pin SOIC, TSSOP and TQFN packages and operates ...