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SN54LVC00A: Figuring out how to set the logic properly

Steven Pavesio
Prodigy 110 points
Part Number: SN54LVC00A

I am trying to use this chip as a low voltage logic inverter. The issue that I am having is that the output is not making any changes regardless if my logic is 1 or 0. The Vcc is 3.3 V. The logic high is 3.3V. I try grounding all inputs that I'm not using and tried setting all the unsed inputs to Vcc. There is still no difference in operation. I'm wondering if there are more pieces I have to add, if I'm not setting the chip up properly, or if it's not working at all.

  • 0
    TI__Guru 62930 points

    Steven,

    There is a truth table in the datasheet. 

    If you are applying logic high to both inputs of a single NAND, then you should see logic low.

    If you apply either of the inputs low, the output should drive high.

    If device is not functioning as expected and you have confirmed the inputs, outputs, and power, then it would seem likely that the device has been damaged.

    Is this on a circuit board with other components?  Possibly other parts of circuit are impacting device. 

    If there is more to the circuit,, then you can post scope shot(s) and/or schematic to help diagnose.

    Regards,

    Wade

  • 0 in reply to Wade Vonbergen
    TI__Guru 62930 points

    Since I have not heard back, I am going to assume that you resolved your issue.

    Please respond back if that is not the case and you need further assistance.

    Please click "This Resolved My Issue" If your issue is resolved.


    Regards,
    Wade