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SN74LVC1G08: Both Input pins have one little pulse during power on

Antony Fu
Expert 3345 points
Part Number: SN74LVC1G08

Hello team,

Customer is using our SN74LVC1G08 in many projects, and we just found both input pins have one little pulse during power on, and we have disconnected the input pins with the host, and just leave them floating, same issue, so would you like to help us check the root?

Pls refer to attachment for detailed information.

Thanks,

Antony

4375.New Microsoft Word Document.docx

  • 0
    TI__Guru* 97046 points

    Hi Antony,

    The output state can change while the device is powering on - typically this only occurs at or below 1V, and operation is only guaranteed from 1.65V to 5.5V. It is a byproduct of the CMOS design architecture and differences in the threshold voltage for the internal MOSFETs that causes the output to temporarily output an incorrect value.

    The input signals are more interesting - there is no circuitry inside the SN74LVC1G08 that drives the inputs to a particular voltage. If the lines are left floating, then it's likely that the power-on of the device is being capacitively coupled through to the input pins. Is there something driving these pins to ground typically during operation?  Is the customer seeing an issue from these power-on signals?