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PCA8574A - Remote 8-bit I/O expander

Download the PCA8574A datasheet PDF. This datasheet also covers the PCA8574 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.

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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (PCA8574-NXP.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by NXP Semiconductors

Part Number Description
PCA8574 Remote 8-bit I/O expander
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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
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.
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