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TXS0206: leakage current of GPIO pins when device is not powered

Intellectual 2720 points
Mike Wang2

Part Number: TXS0206

Hi team,

My customer is planning to use TXS0206 in their battery powered products.

As the system is bat powered, the quiescent/leakage current is very important. In below scenario:

If the TXS0206 is powered off (Vcc=0V), but the GPIO pins are pulled high, what is the leakage current through that GPIO pin?

Thanks,

Mike

Intellectual 2720 points
Mike Wang2
  • Mastermind 32205 points
    Emrys Maier
    Hello,
    Our response will be delayed due to the holidays.

    Have a question about Logic ICs? Get it answered with our newly updated Logic FAQ page

  • Mastermind 32250 points
    ShreyasRao
    Hi Mike,

    The TXS0206 device has internal 40k pullups on the I/Os and the IOs do not have any positive clamp diodes as per the datasheet, the leakage current can be estimated to be V/R; where R is the parallel combination of the external and the internal pullups . I do not see any spec for Ioff or IOZ values on the datasheet which would guarantee the spec.
    I would also suggest to consider using TXS0206A which is a newer version of the device.

    -Thanks,

    Shreyas

    Have a question about TI Logic ICs? Check out the newly updated Logic FAQ page

  • Intellectual 2720 points
    Mike Wang2

    In reply to ShreyasRao:

    Hi Shreyas,

    Thanks for your reply.

    If leakage current is V/R, then that is too big for their application, maybe even more than normal operation.

    do you have the input current spec on input pins during normal operation?

    thanks,

    Mike

  • Mastermind 32250 points
    ShreyasRao

    In reply to Mike Wang2:

    Hi Mike,

    The input pins are guaranteed to be +/- <1uA across temp and process for the both TXS0206 and TXS0206A device.

    -Thanks,

    Shreyas

    Have a question about TI Logic ICs? Check out the newly updated Logic FAQ page

  • Intellectual 2720 points
    Mike Wang2

    In reply to ShreyasRao:

    Hi Shreyas,

    If the EN pin of the device is pulled to GND, how much current would consume through this path?

    From the TXS0206 datasheet, seems there's internal 40kohm pull up resistor. then the current would be Vcc/40kohm, right?

    from ultra low Iq point of view, do you have any other device to recommend?

    thanks.

    Mike

  • Mastermind 32250 points
    ShreyasRao

    In reply to Mike Wang2:

    Mike,

    The enable will not consume Vcc/40k current since the En is an CMOS input pin. the IOs will consume higher current as you have mentioned.

    I would suggest you to consider generic translation devices, TXS0108 or the LSF0108. LSF would need a pullup externally.

    -Thanks,

    Shreyas

    Have a question about TI Logic ICs? Check out the newly updated Logic FAQ page

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