PCA8574 Datasheet - NXP

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

PCA8574-NXP.pdf