Description
PCF8574; PCF8574A Remote 8-bit I/O expander for I2C-bus with interrupt Rev.5 * 27 May 2013 Product data sheet 1.General .
The PCF8574/74A 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
* 100 kHz I2C-bus interface (Standard-mode I2C-bus)
* Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to VDD
with 100 A current source
* 8-bit remote I/O pins that default to inputs at power-up
* Latched outputs di
Applications
* and the latched output ports directly drive LEDs. The PCF8574 and PCF8574A 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 can be up to 16 of these I/O expanders PCF8574/74A tog
