Texas Instruments PCF8574N 8-Bit I2C I/O Expander DIP-16 2.5-6V

The Texas Instruments PCF8574N 8-Bit I2C I/O Expander DIP-16 is an 8-bit input/output expander that adds general-purpose remote I/O to systems using the I2C two-line bidirectional bus, operating from a 2.5V to 6V supply.

Overview

The PCF8574N uses the serial clock (SCL) and serial data (SDA) lines to communicate with most microcontrollers, providing an 8-bit quasi-bidirectional I/O port (P0 to P7). The I/O lines can be used as inputs or outputs without a data-direction control signal. Latched outputs offer high-current drive capability, allowing LEDs to be controlled directly without additional drivers. On power-on, the I/Os are set high, and only a current source to VCC is active.

Key Features

• Open-drain interrupt output for detecting input changes in real-time applications
• Low standby-current consumption, with a maximum of 10µA
• Latch-up performance exceeding 100mA per JESD 78, Class II
• Supply voltage range of 2.5V to 6V

Package and Handling

The device is supplied in a DIP-16 package, which makes it straightforward to integrate into breadboards and prototypes. It has limited built-in ESD protection, so leads should be kept shorted together or the device stored in conductive foam during handling and storage.

Applications

Typical applications include communications networking, computer peripherals, consumer electronics, industrial automation, process control, and signal processing. It is compatible with a wide range of microcontrollers, simplifying the design process.