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TCA9554: replace TCA9534

Shu-Cheng LIN
Guru 11785 points
Part Number: TCA9554

Hi Sirs,

Sorry to bother you.

We know 9554 have internal 100k PU on IO, but 9534 didn't.

But we would like to know 9554 could replace 9534? or 9534 could replace 9554?

Any risk?

Thanks!!

  • 0
    TI__Mastermind 49110 points

    Hey Shu,

    From the looks of it. These devices share the same slave address, are pin to pin, and have the same registers. All of this means we should be able to replace on with the other no problem.

    The only thing which seems different is the internal pull up resistors which you point out.

    Thanks,

    -Bobby

  • 0 in reply to BOBBY
    Guru 11785 points

    Hi Sirs,

    Thanks for your reply, one more question

    In our schematic, if we design in external I/O pull up resistors, and also exploit TCA9554 simultaneously, is it work?

  • 0 in reply to Shu-Cheng LIN
    TI__Mastermind 49110 points
    Hey Shu,

    If you have an external pull up resistor and use TCA9554 then the only thing that will happen is you will have two parallel resistors. If the external resistor is much lower than 100k then the device will effectively only see the external pull up resistor. No problems from doing this.

    Thanks,
    -Bobby