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TCA9535: The input status of TCA9535

John Liu59
Intellectual 2735 points
Part Number: TCA9535

Dear all,

In default mode, the pin of TCA9535 is input port and I want to know if it is a high-z pin during this period?

Thanks.

  • 0
    TI__Guru 63140 points

    Hey John,

    Looking at the functional diagram, the device is indeed a high Z input:

    Q1 and Q2 are controlled by FETs which are not conducting when the device is configured as an input. The XOR and Flip Flops are typically made using FETs and the inputs into these are the gates of a FET which are high impedance.

    Thanks,

    -Bobby

  • 0 in reply to BOBBY
    TI__Intellectual 2735 points
    Thanks, Bobby.