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LSF0102: Pull-up resistor needed for push-pull signal?

Megan Morris
Prodigy 80 points

Part Number: LSF0102
Other Parts Discussed in Thread: SN74AXC1T45

If one of the signals is push pull, do we still need a pull up resistor? For instance, a 1.8V push pull clock needs to transfer to  2.5V, do we need a pull up resistor on 2.5v side?

  • +1
    TI__Guru* 97146 points

    Yes.

    Please see this video for a detailed description of how up-translation works in the LSF family of translators: Up Translation with the LSF Family 

    I would recommend to go ahead and watch the whole series if you're working on a project that includes the LSF - it's a good idea to understand the basics of how this device works as it's probably not exactly what you'd expect.

    As an added note - if a clock signal needs to be changed from 1.8V to 2.5V, I would _not_ recommend using LSF. An active translator like SN74AXC1T45 would be a much better choice. I would only recommend to use LSF in the case where a data signal changes directions without any control signal.