I/O Expander 20-Pin TSSOP T/R

This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 6-V VCC operation.The PCF8574 device provides general-purpose remote I/O expansion for most microcontroller families by way of the I2C interface [serial clock (SCL), serial data (SDA)].The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.

Low Standby-Current Consumption of
10 µA Max

I²C to Parallel-Port Expander

Open-Drain Interrupt Output

Compatible With Most Microcontrollers

Latched Outputs With High-Current Drive
Capability for Directly

Driving LEDs

Latch-Up Performance Exceeds 100 mA
Per JESD 78, Class II