Flip-flops help??? please

Discussion in 'Homework Help' started by ne5pats, Apr 10, 2011.

  1. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    I need to understand how can i wire J-K flip-flops to produce a binary up count at their Q outputs. Also, what is the advantage of a D-type Flip flop when comparing it to the SR flip flops. i have a test and i really need to understand this. Thanks
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Post a sketch of your effort so far at finding a solution. We can then make suggestions on where you may need help.

    In the meantime you will likely benefit from consulting a datasheet on a typical J/K flip-flop. In particular study the published truth table.

    hgmjr
     
  3. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    Here is what i have done so far.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Your clock input to the 7476 goes to a pullup resistor. I don't think that will work. If J4 is left as a short, U1A may get a bit hot.

    What are the NAND gate SR flip flops supposed to demonstrate?
     
  5. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    i put the J/K on the bottom left, but my question is how can i wire J-K flip flops to produce a binary up count at their Q outputs... i am completely lost i wouldn't know how to explain this ... my test is tomorrow and this question was in the review sheet :}
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    What would a binary up count look like on paper? How could you arrange for more than one J-K to produce that output? Hint - one flip flop isn't enough to make a counter.

    With J-K flip flops, the state of J & K determine the output on being clocked. D flip flop's outputs follow the D input when clocked. There is a data sheet available for 7476's and for 7474's - use a search engine to find them. The data sheets give all the details about how the devices work.
     
  7. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
  8. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    thanks alot
     
Loading...