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PCF8574

Part Number	PCF8574
Manufacturer	NXP
Description	Remote 8-bit I/O expander
Published	Mar 22, 2005
Detailed Description	PCF8574; PCF8574A Remote 8-bit I/O expander for I2C-bus with interrupt Rev. 5 — 27 May 2013 Product data sheet 1. Ge...
Datasheet	PCF8574 PDF File

Overview

PCF8574; PCF8574A Remote 8-bit I/O expander for I2C-bus with interrupt Rev.
5 — 27 May 2013 Product data sheet 1.
General 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, or as an output to activate indicator devices such as LEDs.
System master can read from the input port or write to the output port through a single register.
The low current consumption of 2.
5 A (typical, static) is great for mobile 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 ...

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