PCA8574A Datasheet PDF (Remote 8-bit I/O expander)

PCA8574A - Remote 8-bit I/O expander

This page provides the datasheet information for the PCA8574A, a member of the PCA8574 Remote 8-bit I/O expander family.

Description

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 sink capability for directly driving LEDs.
Total package sink capability of 200 mA.
Active LOW open-drain interrupt output.
Eight programmable slave addresses using three address pins.

Datasheet Details

Part number	PCA8574A
Manufacturer	NXP
File Size	416.27 KB
Description	Remote 8-bit I/O expander
Datasheet	PCA8574A Datasheet
Additional preview pages of the PCA8574A datasheet.

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Full PDF Text Transcription

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PCA8574; PCA8574A Remote 8-bit I/O expander for I2C-bus with interrupt Rev. 3 — 3 June 2013 Product data sheet 1. General description The PCA8574/74A 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, 400 kHz I2C-bus interface, three hardware address inputs and interrupt output operating between 2.3 V and 5.5 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. The system master can read from the input port or write to the output port through a single register. The low current consumption of 4.

Published: Apr 24, 2015 |