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AM26C32-EP: Max Overshoot / Undershoot Spec and Max Duty Cycle

high speed guy
Expert 3505 points
Part Number: AM26C32-EP

Hello,

Can you please advise what the:

 

  1. Max overshoot/undershoot spec
  2. Max change in Duty Cycle

 

At the output.  It does not seem to stand out in the datasheet.

Best,

HSG

  • 0
    TI__Guru 62920 points

    Hi HSG,

    For the max change in duty cycle, you could compute this based on the tPLH and tPHL parameters.  The variation between these is at worst 18 ns, so this would be the worst case contribution of the receiver to duty cycle distortion.  This is a pessimistic assumption since it would be unlikely for a single device at a single operating condition to be at a minimum for one spec and a maximum for the other.  But if 18 ns is OK for your application then the current data is OK.  If 18 ns is not OK for your application please let us know and we can see if finer data could be obtained somehow.

    For the overshoot - since this is a receiver, do you mean on the single-ended receiver output?  Or do you mean what is allowed on the input?  (For the latter, you could reference the absolute maximum pin voltages specified.)

    Regards,
    Max

  • 0 in reply to Miguel Robertson
    TI__Expert 3505 points

    Hi Max,

    I am looking for the maximum transient overshoot and undershoot at the single-ended receiver output.

    Thank you,

    HSG 

  • 0 in reply to high speed guy
    TI__Guru 62920 points

    HSG,

    Apologies - I had thought I responded to this some time back but it seems my answer did not post.  The outputs themselves should not overshoot - they use a standard push-pull output stage whose voltage output would be constrained to within the VCC/GND rails.  Due to the relatively fast rise/fall times and low output impedance, though, it is possible that overshoots are generated at the application level due to transmission line effects (particularly if interfaced to longer PCB traces).  In these cases it can be useful to place a series damping resistor (~20-30 Ohms) at the receiver output.

    Regards,
    Max