Description
PCA8574; PCA8574A Remote 8-bit I/O expander for I2C-bus with interrupt Rev.3 * 3 June 2013 Product data sheet 1.General .
The PCA8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).
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
Applications
* and the latched output ports have 25 mA high current sink drive capability for directly driving LEDs. The PCA8574 and PCA8574A are identical, except for the different fixed portion of the slave address. The three hardware address pins allow eight of each device to be on the same I2C-bus, so there ca
