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Need Help Identify Digital Logic Circuit

  1. Sep 23, 2012 #1
    1. The problem statement, all variables and given/known data

    On the data sheet, name the device in Figure 9, and appropriately name the four pins A, B, C, and D according to what the device is. Check your Digital Logic book for some guidance.

    https://mail.google.com/mail/u/1/?ui=2&ik=ca64811c74&view=att&th=139f410abe33126b&attid=0.1&disp=inline&safe=1&zw

    2. Relevant equations

    None

    3. The attempt at a solution

    So I've set up a truth table for this equation and got

    A B C D
    0 0 1 1
    0 1 1 0
    1 0 0 1
    1 1 0 0

    So having looked at this, it appears as if the two inputs are reversed. However, I'm not sure if there is an actual device out there that this represents, or just a configuration of gates. I've checked my books and nothing sticks out. Any ideas?
     
  2. jcsd
  3. Sep 24, 2012 #2

    CWatters

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    At time of writing I can't see the diagram.
     
  4. Sep 24, 2012 #3

    berkeman

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    I'm not able to see the linked image either -- it just takes me to Google g-mail sign-in if I try the link directly...
     
  5. Sep 24, 2012 #4

    LCKurtz

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    What link? I don't even see a link in the OP.
     
  6. Sep 24, 2012 #5

    berkeman

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    Click "Quote" to see the content of his post.

    Of course I cheated, and clicked the "Edit" button on his post to see the link, but only green folks have access to that button... :smile:
     
  7. Sep 24, 2012 #6

    LCKurtz

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    OH NO!! This forum is being run by little green men from outer space????
     
  8. Sep 25, 2012 #7

    CWatters

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    How does that help? I can see the link but how do we use/edit that to see the image?
     
  9. Sep 25, 2012 #8

    NascentOxygen

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    It certainly does appear that C= ¬A and D= ¬B
    but until you post your image on a site where it is publicly accessible no one can advise further.
     
  10. Sep 25, 2012 #9

    berkeman

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    Sometimes I'm able to paste the link itself into my browser and get to the image, but in this case it didn't work. Other times I can edit the link a bit to get into the website at a higher level and navigate to the image (if it has been moved at the website or something similar).
     
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