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PCA9544AD - 4-channel I2C-bus multiplexer

Download the PCA9544AD datasheet PDF. This datasheet also covers the PCA9544A variant, as both devices belong to the same 4-channel i2c-bus multiplexer family and are provided as variant models within a single manufacturer datasheet.

General Description

The PCA9544A is a 1-of-4 bidirectional translating multiplexer, controlled via the I2C-bus.

The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels.

Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register.

Key Features

  • 1-of-4 bidirectional translating multiplexer.
  • I2C-bus interface logic; compatible with SMBus.
  • 4 active LOW interrupt inputs.
  • Active LOW interrupt output.
  • 3 address pins allowing up to 8 devices on the I2C-bus.
  • Channel selection via I2C-bus.
  • Power-up with all multiplexer channels deselected.
  • Low Ron switches.
  • Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses.
  • No glitch on power-up.
  • Supports hot insertion.
  • Low st.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (PCA9544A_PhilipsSemiconductors.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
PCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer Texas Instruments
PCA9541 2-to-1 I2C-bus master selector NXP Semiconductors
PCA9541A 2-to-1 I2C-bus master selector NXP Semiconductors
PCA9542A 2-channel I2C-bus multiplexer and interrupt logic NXP Semiconductors
PCA9543A 2-Channel I2C Bus Switch Texas Instruments

Other Datasheets by NXP Semiconductors

Part Number Description
PCA9544A 4-channel I2C-bus multiplexer
PCA9544ABS 4-channel I2C-bus multiplexer
PCA9544APW 4-channel I2C-bus multiplexer
PCA9544 4-channel I2C multiplexer and interrupt controller
PCA9540 2-channel I2C multiplexer

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
PCA9544A 4-channel I2C-bus multiplexer with interrupt logic Rev. 5 — 23 April 2014 Product data sheet 1. General description The PCA9544A is a 1-of-4 bidirectional translating multiplexer, controlled via the I2C-bus. The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an AND of the four interrupt inputs, is provided. A power-on reset function puts the registers in their default state and initializes the I2C-bus state machine with no channels selected.