building circuit using a decoder

Discussion in 'Homework Help' started by facetten, Nov 2, 2007.

  1. facetten

    Thread Starter Member

    Nov 1, 2007
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    can anyone give me some ideas of how to approach this problem?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    You will need more gates. One quad AND will not be sufficient. Some XOR functions will be necessary to evaluate the NOT conditions, as well as some NOR and NAND gates. One three input NAND, for instance, will be TRUE for X'*Y'*Z' as inputs.
     
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I think he/she meant to say that there is a 74xx138 available also.
     
  4. facetten

    Thread Starter Member

    Nov 1, 2007
    11
    0
    there is a 74x138 available, well it's past the due days already, so i just connected the outputs to NAND gates
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    You should notice that you said "41x138" in your original post.
     
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