General Description

The MIC74 is a fully programmable serial-to-parallel I/O expander compatible with the SMBus™ (system management bus) protocol. It acts as a “slave” on the bus, providing eight independent I/O lines.

Features

• Provides eight bits of general purpose I/O

• Built in fan speed control logic (optional)

• 2-wire SMBus™/I2C™ compatible serial interface plus interrupt output

• 2.7V to 3.6V operating voltage range

• 5V-tolerant I/O

• Low quiescent current: 2µA (typical)

• Bit-programmable I/O options:

– input or output

– push-pull or open-drain output

– interrupt on input changes

• Outputs can directly drive LEDs (10mA IOL)

• Up to 8 devices per bus

Applications

• General purpose I/O expansion via serial bus

• Personal computer system management

• Distributed sensing and control

• Microcontroller I/O expansion

• Fan Control