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SN74AUC16374: is it ok if input signal overshot to -0.8V?

Ruixin Feng
Intellectual 2395 points
Part Number: SN74AUC16374

Hi team,

Customer is usingSN74AUC16374 and input signal will be like yellow waveform as shown, it'll overshoot to -0.8V but our abs.max is -0.5V. Could you pls help to confirm if this overshoot will cause damage to the device?

Any reliability risk?

Thanks！

Rayna

  • 0
    TI__Guru* 97046 points

    Hi Rayna,

    I would first recommend to verify that this measurement is accurate -- it is very common to see excessive ringing when using a standard passive scope probe:

    The ground lead on the scope probe has a fairly significant length and loop area that contributes to ringing.

    It's best to either test with a differential probe or a very short ground lead.

    -

    If this is an actual undershoot and not just measurement error, then I would say that they should add some series resistance at the input to prevent excessive current.

    With -1V at the input, a resistor of value of only 10 ohms would be sufficient to limit current to 50 mA. I would recommend to use 100 ohms to keep any current through the diode low.