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AM26LV32E-EP: AM26LV32EMDREP

sunil malhotra
Prodigy 20 points
Part Number: AM26LV32E-EP

Page 4 data  sheet states that Ri is 4K ohm min and 17 K ohm , what is  maximum K ohms.

Is there more data for Ri  for the parts that are being shipped

  • 0
    TI__Guru 52082 points

    Hi Sunil,

    We do not specify a maximum input impedance as designs should be designed for the lower impedance - as the lower impedance will have the most negative impact on the bus.

    For impedance matching reasons on an RS-422 bus - the last receiver on the bus should be terminated with a 100 Ohm resistor between differential inputs (with transmission line characteristic impedance as close to 100 as possible to mitigate reflections) with the assumption that all non-terminated devices have stub lengths shorter than 1/10 of the rise time * signal propagation through transmission line/cable (should be a percentage of c - 70% to 75% of c are common values - but this is specific to the cable/trace used.) 

    The maximum input impedance could also vary on multiple factors so its hard to give a value for the max.

    Is there a specific reason why you are concerned with the maximum input impedance that goes beyond what I explained above? 

    Best,

    Parker Dodson