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About OE pulldown resister of TXS / TXB series

Satoshi
Guru 19645 points
Other Parts Discussed in Thread: TXS0108E

TXB /TXS series datasheet written that Output Enable (OE) connect pulldown resister.

※For example, TXS0108E datasheet P17

Is this necessary to use?

If use case, is pullup resister value 4.7kΩ, no problem?

 

Best regards,

Satoshi

  • 0
    TI__Expert 6335 points

    Satoshi,

    I used the e2e forum search tool (using the term "OE resistor TX*") to find a thread that addresses your question:

    As long as there is no need to place the I/O pins into Hi-Z, then you may connect the OE pin to VCCA using a pullup resistor, or even a short.

    Best Regards,

    Nirav

  • 0 in reply to Nirav Patel
    Guru 19645 points
    Nirev-san
    Thank you for reply.

    Additional question, what are the condition of I/O pin into Hi-Z?
    For example, is OE need pulldown only control signal case?
    (when OE connect to VCC, is pulldown unnecessary?)

    Best regards,
    Satoshi
  • 0 in reply to Satoshi
    TI__Expert 6335 points

    Satoshi,

    Additional question, what are the conditions of I/O pin into Hi-Z? For example, is OE need pulldown only control signal case?

    Other than the I/O limits that are listed in the datasheets, there is no additional special requirement on any of the I/O pins before enabling Hi-Z.

    When OE connects to VCC, is pulldown unecessary?

    The pulldown is not necessary if the Hi-Z feature on the I/O pins is *never* required. If there is no need for Hi-Z, then there is no need to drive the OE pin voltage low, so there is no need for a pulldown resistor.

    I hope that I have understood your questions properly. If not, please clarify. Thanks.

    Best Regards,

    Nirav