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SN74LVC07A: can voltage on IN or OUT pin be larger than VCC voltage?

Max Han
Intellectual 2260 points
Part Number: SN74LVC07A


Hi 

currently, VCC is 3.3V.

but input signal high level is 5V. is this ok?

if customer set pull up voltage of output 5V, is this ok?

thanks.

  • 0
    TI__Genius 16735 points

    Hi Max

    This setup looks perfectly fine to me. The customer is trying to down translate from 5 V to 3.3 V and this is one of the ways to do it. I am reconfirming that you meant the customer has a 3.3V pull up on the output and a 5V pull up on the input.

    Another possible way to do this is that the customer can use another buffer that has push pull outputs instead of open drain output like this device, then they can get away with not needing the 3.3 V pull up at the output. This would reduce board space as well give them better transition times.


    Thanks!
    - Karan

  • 0 in reply to Karan Kotadia
    TI__Intellectual 2260 points

    Hi Karan,

    thanks for your answer.

    customer want to konw: at start up or shut down condition, VCC is 0V but input pull up voltage is still 5V or output pull up voltage is still 5V, does this damage this device?

    thanks.

  • 0 in reply to Max Han
    TI__Genius 16735 points
    Hi,

    This should not damage the device. The device will be in high impedance since it has 0V on it.

    Thanks!
    -Karan