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SN65C1168: What should I do with unused

Charles Wolfe
Prodigy 110 points

Part Number: SN65C1168

Tool/software:

I am only using 3 of the 4 channels. What should I do with the I/O of the channel I am not using? Should I leave them unconnected? Should I pull them up/down? And what size pull-up/pull-down resistor should I use?

  • +1
    TI__Guru* 78301 points

    You can leave the RS422 pins floating. The A/B lines have internal pull up and pull down resistors. The Y/Z pins are outputs so they can be left open.

    The R pins can be left floating as well since they are output pins.

    Pins you should bias are input (D) pins. You can just tie them to GND with a resistor, maybe around 10k. 

    -Bobby