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AM26C32-EP: How to Properly Terminate Unused Channel Input Pins of Receiver IC?

Kiran Kumar Valiveti
Prodigy 40 points
Part Number: AM26C32-EP

Tool/software:

How to Properly Terminate Unused Channel Input Pins of Receiver IC? 

While Referring Receiver IC Unused Input Pins there have Seen 2 Scenarios where both A & B Pins Terminated to Ground and in other scenario A to GND and B to VCC, Which is the best Practice? (In Both Scenario, Corresponding Y Output Pin is Floating)

  • 0
    Guru 298380 points

    As shown in the input schematic on p. 3, the A/B pins have internal pull-up/-down resistors. You can leave the unused A/B pins open.

    You can tie the A/B pins to different voltages, but you should never tie both to the same voltage.

  • 0 in reply to Clemens Ladisch
    Prodigy 40 points

    Thanks Clemens for Response, But As the Page 3 Shows Pull Up/Down Resistor tied to VCC for A Input and GND for B Input.....Instead of Leaving Unused A/B as Open, If we need to tie them directly to VCC or GND....Is it advised to keep the A tied to VCC and B tied to GND? or Vice Versa?

  • +1 in reply to Kiran Kumar Valiveti
    Guru 298380 points

    It does not really matter. Tying A to VCC will save a very little bit of power.

  • 0 in reply to Kiran Kumar Valiveti
    TI__Guru 63330 points

    Hi Kiran,

    As Clemens pointed out, It doesn't really matter. If you wanted to you could just set up a external fail safe bias using something like 10k pull up on A and a 10k pull down on B.

    -Bobby