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TXS0104E: Customer mixing push pull and open drain

Jeff Coletti
Expert 8755 points
Part Number: TXS0104E
Other Parts Discussed in Thread: TXB0104

Hi Support team

Customer and I are a bit confused, he wants to run both open drain and push pull signals thru the TXS0104E. Data sheet states -The TXS0104E device can also be used in applications where a push-pull driver is connected to the data I/Os, but the TXB0104 device might be a better option for such pushpull applications.. Can you explain?

Thanks

Jeff

  • 0
    TI__Guru 61570 points
    Hi Jeff,

    The TXS has internal 10k pullup resistors. Hence, it will always drain current during normal operation or when a default state is low. This internal pullup resistor will also affect the Vol level,especially with a weak driver trying to sink all the current and maintain a logic low.
    Having said that, TXS can still work as voltage translation device for both push pull and open drain interfaces, however, it is suited for open drain just because of the integrated pull-up resistor. This avoids having external pullup resistors thus saving cost and space.
    TXB are buffered translation device and hence suited for push pull interface, and not suitable for open drain.
    Please let me know if you need anything else.