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PCA8574 - Remote 8-bit I/O expander

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)).

Key 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

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Full PDF Text Transcription for PCA8574 (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for PCA8574. For precise diagrams, tables, and layout, please refer to the original PDF.

PCA8574; PCA8574A Remote 8-bit I/O expander for I2C-bus with interrupt Rev. 3 — 3 June 2013 Product ...

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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.