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Additional data on input current SN54LVCH244A

David Merrill
Intellectual 2305 points

Other Parts Discussed in Thread: SN54LVCH244A

Is there any additional data than whats in the data sheet regarding the input current to the input required for switching. part# sn54lvch244a

Thanks.

  • 0
    Prodigy 30 points

    David - thanks for posting my question.  The data sheet indicates 500uA max for switching inputs to opposite logic state.  Is there any data that shows typical or minimum switching current.  My circuit may not provide 500uA guaranteed and I'm trying to quantify my risk of missing logic transitions at the input.

  • 0 in reply to Larry Reynolds
    TI__Guru 62930 points

    Larry, there is a fair amount of variability across environmental conditions.

    Most notably VCC.  What voltage are you operating at?     The higher the VCC, the closer to the 500ua limit.

    Additionally, at min temp, it will have a stronger hold.   This may help quantify your risks if your system never operates below room temp.

    Regards,

    Wade

  • 0 in reply to Wade Vonbergen
    Prodigy 30 points

    Wade, I am operating at 3.3V VCC.  My temp range is -40 to +85C.  Is there any information on the minimum bus switch current?  I was hoping that someone could tell me that it is designed for some nominal current with tolerance for temperature.  For example 400uA +/- 100uA or 300uA +/-200uA.  I understand that TI wouldn't guarantee anything except the max, but anythin additional would be appreciated.

  • 0 in reply to Larry Reynolds
    TI__Guru 62930 points

    Larry, the data I have is from a different device, with same bus holder circuit and limits.

    I do not have a 3.3v datapoint, but do have 3 and 3.6v.

    Your estimate is pretty close to actual.  At 3.6v, I see the range go from 250 to 450 with the nominal around 375 to 400.

    At 3v, the range changes from 200 to 325 with the nominal about 250.

    You are also correct, in that we can only guarantee the 500ua limit that is in the specification.

    Regard,

    Wade

  • 0 in reply to Wade Vonbergen
    Prodigy 30 points

    Wade,  That info is much appreciated.  I fully understand the guaranteed limit and thanks for sharing one datat point of testing.  Many thanks.