PCA8574 Datasheet (NXP) - Remote 8-bit I/O expander

PCA8574, Remote 8-bit I/O expander

The PCA8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).

The devices consist of eight quasi-bidirectional ports, 400 kHz I2C-bus interface, three hardware address inputs and interrupt output operating between 2.3 V

PCA8574 Features

* I2C-bus to parallel port expander

* 400 kHz I2C-bus interface (Fast-mode I2C-bus)

* Operating supply voltage 2.3 V to 5.5 V with 5.5 V tolerant I/Os held to VDD with 100 A current source

* 8-bit remote I/O pins that default to inputs at power-up

* Latched outputs with 25 mA si