The PCF8574N is an I2C-bus IO expander with interrupt output from Texas Instruments. It features an 8-bit I/O port, open-drain interrupt output, and address pins to support up to 8 devices on the bus. The PCF8574N can be programmed to detect a variety of conditions on the input lines and generate an interrupt signal when any of these conditions is detected. This IO expander is ideal for applications requiring a low power consumption, flexible addressability and minimal pin count. The PCF8574N can be used in applications including motor control, port expansion, LCD display driver, relays, transducer interface and general purpose data acquisition.