output of simple logic circuit

Discussion in 'Homework Help' started by sagar474, Jul 22, 2010.

  1. sagar474

    Thread Starter New Member

    Jul 22, 2010
    16
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    [​IMG]
    what is the out put Y of this logic circuit?
    those are nand and nor gates
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Have you tried to determine the states of A & B that will produce Y? After that, it's simple to work in the C input. It's helpful if you label the gates, too (U1, U2, etc.).
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    Start from the list with all possible combinations of A, B and C. Then work your way from the left to the right of the circuit. For given A and B find the output of the first gate. Then use it along with B to find the output of the second gate and so on.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Basically what has been said previous. Just make and use a truth table. If you need visual assistance draw the circuit 8 times, and use a red or green magic marker to record the output of each gate to fill the truth table.
     
  5. raihanbd89

    New Member

    Jul 30, 2010
    2
    0
    Wht r d input of d right most nand and left most nor gate?? Actually i can't figure it out.
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    See post #3. Make a truth table:

    A..B..C..Y
    0..0..0..?
    1..0..0..?
    etc.
     
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