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Jk flip flop

  1. Jan 26, 2006 #1
    does anybody knows how to read the table or has any explanation for jk flip flop??any website recommended pls.........
  2. jcsd
  3. Jan 26, 2006 #2


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  4. Jan 26, 2006 #3


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    That flip flop is probably a little more complicated than what he needs since it includes "pre" and "clr" inputs. The wikipedia article has a slightly simpler one:

    (the J-K flip flop truth table halfway down the page)

    The flip flop has 2 inputs, J and K (and also the clock). It remembers what the output Q was previously. On a clock edge, if J and K are 0, then the output Q remains unchanged. If J and K are 1, then the output Q flips from a 0 to a 1 or from a 1 to a 0. If K is 1 and J is 0, Q is set to 0, and if K is 0 and J is 1, Q is set to 1.
  5. Jan 26, 2006 #4
    What helped me was understanding fully basic idea of flip-flop and what S-R ff does, then J-K is just S-R with only difference in 11 input, where S-R goes unstable while J-K toggles (complements current state).

    But basically, as was said above: Q' is what you are "concerned" about, i.e. next state. Q' is a ff-particular function that depends on inputs J and K and present state Q. In other words, D and JK ff react (or have Q' function) differently to the same inputs and current state Q.
    Last edited: Jan 26, 2006
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