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Logic gate technology

  1. Mar 13, 2015 #1
    The problem statement
    Hi
    I'm writing a report on a design of a basic all-NAND circuit.
    In reality, how are these circuits made ? Do we just use TTL etc. integrated circuits and combine them as necessary?

    Thanks
     
    Last edited by a moderator: Mar 13, 2015
  2. jcsd
  3. Mar 13, 2015 #2

    CWatters

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    Do you understand why you might want to restrict yourself to using only NAND gates?
     
  4. Mar 13, 2015 #3

    NascentOxygen

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    So long as you stick with the one technology, e.g., TTL, you can connect up gates as needed. That's 99% correct.
     
  5. Mar 13, 2015 #4

    Zondrina

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    Some options include NMOS logic, PMOS logic, DTL, TTL, ECL; The popularity of these methods in microprocessor design has decreased in place of CMOS logic.
     
  6. Mar 13, 2015 #5

    Merlin3189

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    Can I recommend this link http://www.ibiblio.org/kuphaldt/electricCircuits/Digital/DIGI_3.html#xtocid1010712
    It's a bit long-winded but covers basic gates pretty thoroughly. In here you will find an exact answer to your question - "all-NAND" (at least, it is there: whether you'll find it, is another matter! I found it, but I knew what I was looking for.)
    It covers both xTL and CMOS logic, so whichever type you choose to talk about, the same info is there.

    "In reality, how are these circuits made ? Do we just use TTL etc. integrated circuits and combine them as necessary?"
    I'm not quite sure what you're getting at here. Of course people do combine ICs as necessary, but I think the "all-NAND" concept is referring to how we design the ICs in the first place.
     
  7. Mar 14, 2015 #6

    CWatters

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    Indeed. Some technologies favour NAND gates. If I remember correctly ECL favours NOR gates.
     
  8. Mar 14, 2015 #7
    Thanks everyone.
     
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