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NCA9547A - 8-channel I2C-bus multiplexer

Datasheet Summary

Description

The NCA9547A is an octal bidirectional translating multiplexer controlled by the I²C-bus.

The SCL/ SDA upstream pair fans out to eight downstream pairs, or channels.

Only one SCn/SDn channel can be selected at a time, determined by the contents of the programmable control register.

Features

  • 1-of-8 bidirectional translating multiplexers.
  • I²C-bus interface logic; compatible with SMBus standards.
  • Active LOW reset input.
  • Three address pins allowing up to eight devices on the I²C-bus.
  • Channel selection via I²C-bus, one channel at a time.
  • Power-up with all channels deselected, except channel 0 which is connected.
  • Low Ron multiplexers.
  • Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses.

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Datasheet Details

Part number NCA9547A
Manufacturer nexperia
File Size 689.44 KB
Description 8-channel I2C-bus multiplexer
Datasheet download datasheet NCA9547A Datasheet
Additional preview pages of the NCA9547A datasheet.

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Full PDF Text Transcription

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NCA9547A 8-channel I²C-bus multiplexer with reset Rev. 1 — 20 August 2025 Product data sheet 1. General description The NCA9547A is an octal bidirectional translating multiplexer controlled by the I²C-bus. The SCL/ SDA upstream pair fans out to eight downstream pairs, or channels. Only one SCn/SDn channel can be selected at a time, determined by the contents of the programmable control register. The device powers up with Channel 0 connected, allowing immediate communication between the controller and downstream devices (targets) on that channel. An active LOW reset input allows the NCA9547A to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state.
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