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Why is there noe EX-NAND Gate?

Discussion in 'General Electronics Discussion' started by TonyCollins, Mar 27, 2012.

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  1. TonyCollins

    TonyCollins

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    Sep 12, 2011
    Why can an AND Gate not become and EX-NAND Gate.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
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    Jan 21, 2010
    Firstly, how do you convert a OR gate into a AND gate?

    Now do the same thing to an XOR gate and see what happens (It should logically become EX-AND, right?)

    See what happens.
     
  3. GonzoEngineer

    GonzoEngineer

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    Dec 2, 2011

    LMAO:D
     
  4. GreenGiant

    GreenGiant

    842
    6
    Feb 9, 2012
    I may be exposing some obvious logic here but wouldn't an EX-NAND act exactly the same as a NAND? only off when all inputs are high?

    or would it only be on when no inputs are high? :rolleyes:
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
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    Jan 21, 2010
    It depends on your definition of exclusive NAND. If one assumed that XOR could be turned into XAND by inverting the inputs and outputs (a la De Morgan), an XNAND would be that with the output inverted.

    Did you try writing down the truth tables for it.

    I promise you that you'll be surprised.
     
  6. War_Spigot

    War_Spigot

    43
    0
    Feb 20, 2012
    XAND is always false, and XNAND is always true. I think turning an AND gate into a XNAND would involve connecting both inputs to +V.

    To be honest, I exclusively use XAND and XNAND gates in my logic designs...
     
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