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Home > Embedded ICs > Embedded - Microcontroller Unit (MCU) > TCA9543APWR
Texas Instruments

TCA9543APWR

TCA9543APWR

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TCA9543APWR Overview

The TCA9543A is a dual bidirectional translating switch controlled by theI2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, orchannels. Either individual SCn/SDn channel or both channels can be selected, determined by thecontents of the programmable control register. Two interrupt inputs(RESET low resets the I2C statemachine and causes both of the channels to be deselected, as does the internal power-on resetfunction.

The pass gates of the switches are constructed such that the VCC terminal can be used tolimit the maximum high voltage, which will be passed by the TCA9543A. This allows the use ofdifferent bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-Vparts without any additional protection. External pull-up resistors pull the bus up to the desiredvoltage level for each channel. All I/O terminals are 5.5-V tolerant.

Features

  • 1-of-2 Bidirectional Translating Switches
  • I2C Bus and SMBus Compatible
  • Two active-low interrupt inputs
  • Active-low interrupt output
  • Active-low reset input
  • Two address pins allowing up to four TCA9543A devices on theI2C bus
  • Channel selection via I2C bus, in anycombination
  • 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
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of 1.65-V to 5.5-V
  • 5.5-V Tolerant inputs
  • 0 to 400-kHz Clock frequency
  • Latch-up Performance exceeds 100-mA Per JESD78
  • ESD Protection exceeds JESD 22
    • 4000-V Human-body model (A114-A)
    • 1500-V Charged-device model (C101)

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Specifications

Circuit Diagram

TCA9543APWR

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