LT Spice digital logic gates

Discussion in 'Homework Help' started by Random3s, Dec 2, 2014.

  1. Random3s

    Thread Starter Member

    Jul 30, 2014
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    Hi all,

    I am looking for some information on adding logic gates to ltspice. I just need some 2 input standard logic gates, AND, OR etc, I have read that there are some available at the ltspice yahoo group, which I joined... but I am unable to find the right files I need.. does anyone know where the files are located, or at least how they are named?

    Thanks in advance
     
  2. WBahn

    Moderator

    Mar 31, 2012
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  3. Papabravo

    Expert

    Feb 24, 2006
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    AFAIK they are in the standard library. You do have to do some work to get them to behave like real gates however. Check the help files.

    click "Component | Digital |{and, or, xor, inv,...}
    They have to be configured for Vcc and prop delay to model real gates.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    In the Yahoo LTspice group, go to LTspiceFiles/Files/LTspiceFiles/ and download the three zipped Lib parts.
    Within one of those Lib parts there should be several folders labelled Digital ...
     
  5. Papabravo

    Expert

    Feb 24, 2006
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    What do these files have that the standard files do not? Have they been modified to mimic actual parts for example?
     
  6. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    They have specific models for e.g. the CD4000, 74HC and 74HCT logic families.
     
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