Description

This 8-bit input/output (l/O) expander for the two-linebidirectional bus (i2C) is designed for 2.5-V to 6-VVcc operation.

The PCF8574A deviceprovides general-purposeremote l/O expansion for most microcontrollerfamilies via the 2C interface [serial clock (SCL), seriadata (SDA)]

The device features an 8-bit quasi-bidirectional I/Oport (PO-P7),including latched outputs with high-current drive capability for directly driving LEDs. Eachquasi-bidirectional l/O can be used as an input oroutput without the use of a data-direction controsignal. At power on, the I/Os are high. In this modeonly a current source to Vcc is active.

Features

Low Standby-Current Consumption of 10 UA Max2C to Parallel-Port ExpanderOpen-Drain Interrupt OutputCompatible With Most MicrocontrollersLatched Outputs With High-Current DriveCapability for Directly Driving LEDsLatch-Up Performance Exceeds 100 mA PerJESD 78. Class ll

Applications

Telecom Shelters: Filter Units

Servers

Routers (Telecom Switching Equipment)

Personal Computers

Personal Electronics

Industrial AutomationProducts with GPIO-Limited Processors