PCF8574 Description
The PCF8574/74A 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, 100 kHz I2C-bus interface, three hardware address inputs and interrupt output operating between 2.5 V and 6 V. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads,...
PCF8574 Key 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
- 8-bit remote I/O pins that default to inputs at power-up
- Latched outputs directly drive LEDs
- Total package sink capability of 80 mA
- Active LOW open-drain interrupt output
- Eight programmable slave addresses using three address pins
- Low standby current (2.5 A typical)
- 40 C to +85 C operation
PCF8574 Applications
- I2C-bus to parallel port expander