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NCA9548A - 8-channel I2C-bus switch

Datasheet Summary

Description

The NCA9548A is an octal bidirectional translating switch controlled via the I²C-bus.

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

Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register.

Features

  • 1-of-8 bidirectional translating switches.
  • 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, in any combination.
  • Power-up with all switch 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.
  • Suppor.

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Datasheet preview – NCA9548A

Datasheet Details

Part number NCA9548A
Manufacturer nexperia
File Size 745.12 KB
Description 8-channel I2C-bus switch
Datasheet download datasheet NCA9548A Datasheet
Additional preview pages of the NCA9548A datasheet.

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Full PDF Text Transcription

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NCA9548A 8-channel I²C-bus switch with reset Rev. 1 — 20 August 2025 Product data sheet 1. General description The NCA9548A is an octal bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. An active LOW reset input allows the NCA9548A to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machine and causes all the channels to be deselected as does the internal Power-on reset function.
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