Specifications:

Operating voltage: 2.5 V to 6 V with non-overvoltage tolerant I/O held to VDD with 100 uA current source

Operating temperature: -40~85 Celsius

Low Standby-Current Consumption of 10 μA Max

I2C to Parallel-Port Expander

100 kHz I2C-bus interface (Standard-mode I2C-bus)

Open-Drain Interrupt Output

with Most Microcontrollers

Latched Outputs with High-Current Drive

Capability for Directly Driving LEDs

Latch-Up Performance Exceeds 100 mA

Features:

Based on the I2C interface I / O expansion modules, use I / O scalability eight I / O (up to 8 simultaneous use PCF8574, expanded to 64 I / O).

The most important feature:

1. interface types access target board: Pin or row seat

2. Supports I2C bus cascade (by pin, row seat docking method, which can use multiple I2C modules)

Typical applications: for I / O resources were scarce MCU I / O expansion

The main resource: PCF8574, I2C interfaces, eight parallel

Package :

8pcs PCF8574 PCF8574T Communication Module

PCF8574 Blue module function: I2C interface, I/O expansion module, I/O scalability 8 I/O (up to 8 simultaneous use the PCF8574 expanded to 64 I/O).
Supports interface types access target board: Pin or row seat, I2C bus cascade(by pin header row seat docking methods can be used simultaneously multiple I2C modules).
Typical application: I/O resource shortage MCU I/O expansion main resources: the PCF8574 I2C interface, 8-bit parallel.
Information includes: test procedures(AVR, STM8, C8051F) circuit schematics related PDF data.
Package : 8pcs PCF8574 IO Expansion Board I/O Expander I2C-Bus Evaluation Development Module