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Texas Instruments

TCA9545APWR

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TCA9545APWR Overview

The TCA9545A is a quad bidirectional translating switch controlled via theI2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, orchannels. Any individual SCn/SDn channel or combination of channels can be selected, determined bythe contents of the programmable control register. Four interrupt inputs(RESET low resets the I2C statemachine and causes all 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 TCA9545A. 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-4 Bidirectional translating switches
  • I2C bus and SMBus compatible
  • Four active-low interrupt inputs
  • Active-low interrupt output
  • Active-low reset input
  • Two address terminals, allowing up to four 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-Vbuses
  • No glitch on power-up
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of1.65 V to 5.5 V
  • 5.5 V Tolerant inputs
  • 0 to 400-kHz Clock frequency
  • Latch-Up performance exceeds 100 mA per JESD 78
  • ESD Protection exceeds JESD 22
    • 4000-V Human-body model (A114-A)
    • 1500-V Charged-device model (C101)

Specifications

Circuit Diagram

TCA9545APWR

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