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AM26LV32: VID Logical Output Consult

Stanley Dai
Expert 5810 points
Part Number: AM26LV32

Hi Team,

For the below red frame logical output part, customer is consulting whether the logical output state will follow previous state here? Or just no-sure that? Thanks.

Best,

Stanley

  • +1
    Guru 316470 points

    The output state really is undefined. It might be high, or low, or oscillate.

    Many modern transceivers have inputs with a defined output state at VID = 0 V (the undefined range is between −0.2 V and −0.05 V). But there are no quad receivers with this feature.

  • 0 in reply to Clemens Ladisch
    TI__Expert 5810 points

    Hi Clemens,

    However, customer tested to find out that the output state is following previous state when VID is between -0.2V and 0.2V. What's the potential reasons here? Pls see below, the yellow one is VID curve.

    Best,

    Stanley

  • +1 in reply to Stanley Dai
    TI__Guru 52052 points

    Hi Stanley,

    The logic table is there to show when we guarantee a logic level. When VID is held in-between -0.2V and 0.2V we don't guarantee what the value will be, and even with this test that the customer has done we still don't recommend holding the bus at -0.2V / 0.2V to ensure proper logic outputs.  

    Please let me know if you have any other questions!

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    Guru 316470 points

    The input is likely to have some hysteresis. However, there are no guarantees where the switching thresholds might be, except that they are somewhere between −0.2 V and 0.2 V.