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PCF8574A - Remote 8-bit I/O expander

Download the PCF8574A datasheet PDF. This datasheet also covers the PCF8574 variant, as both devices belong to the same remote 8-bit i/o expander family and are provided as variant models within a single manufacturer datasheet.

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)).

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 with 100 A current source.
  • 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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (PCF8574_PhilipsSemiconductors.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
PCF8574A Remote 8-Bit I/O Expander Texas Instruments
PCF8574 Remote 8-Bit I/O Expander Texas Instruments
PCF8574N Remote 8-Bit I/O Expander Texas Instruments
PCF8570C 128 x 8 Bit / 256 x 8 Bit Static Ram Philips
PCF8571 128 x 8 Bit / 256 x 8 Bit Static Ram Philips

Other Datasheets by NXP Semiconductors

Part Number Description
PCF8574 Remote 8-bit I/O expander
PCF8570 256 x 8-bit static low-voltage RAM
PCF8573 Clock/calendar
PCF8575 Remote 16-bit I/O expander
PCF8575C Remote 16-bit I/O expander

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
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.