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Logic circuit

  1. Jan 6, 2009 #1
    I am attempting to simulate the 4017 chip in multisim but I am not getting the expected result. I doubt that multisim is incorrectly simulating the chip, so I think that I am probably just hooking it up incorrectly.

    http://www.doctronics.co.uk/4017.htm
    http://www.doctronics.co.uk/pdf_files/4017.pdf

    [​IMG]

    As you can see from the picture, I am giving the 4017 a square wave input and everything works except ~Q5-9 doesn't seem to work at all. For some reason, I can't seem to get ~Q5-9 to change from 0 V no matter what I do. According to the doctronics website and the datasheet, this pin should be high when Q0 to Q4 is high... but it never is.

    Does anyone know what I am doing incorrectly? Unfortunately I do not have the actual chip to do this in reality.
     
  2. jcsd
  3. Jan 6, 2009 #2

    berkeman

    User Avatar

    Staff: Mentor

    It's very hard to read how you have it hooked up from your diagram. Have you connected all the enables? Power, reset, etc.?
     
  4. Jan 6, 2009 #3
    I don't know about multisim but, how do you set the trigger source of XSC1?
     
  5. Jan 6, 2009 #4
    Thanks for your replies,

    I was able to get it to work correctly after putting two inverters in series with the ~O5-9 output to amplify the signal.

    I don't see why I needed to amplify this signal when the other outputs work just fine...
    In reality I plan on using the 74hc4017 not the cmos version but I hope that I won't have to do that once I get the actual chips.
     
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