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What does J-K in J-K flip flop indicate?

Discussion in 'Electronic Design' started by Prasad, Oct 4, 2004.

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  1. Prasad

    Prasad Guest

    In case of all other flip flops ,the names indicate something about their function.
    D-delay or data

    then what does j-k in j-k flip flop indicate.
    reply me if u know anything about this.
  2. Bob Stephens

    Bob Stephens Guest

    John Kerry!!!

  3. Joerg

    Joerg Guest

    Hi Prasad,

    I believe that was in honor of Jack Kilby (J.K.) who invented the IC.

    Regards, Joerg
  4. Shucks, and here I was hoping it might be... my name. ;)

  5. Rich Grise

    Rich Grise Guest

    It sounds so mundane, but I actually think they picked them because they
    were the next letters in sequence to designate arbitrary stuff, much the
    same way that they use Q for transistors, and U for ICs. E is volts, F is
    Farads, G is conductance, H is hysteresis or Henrys or something to do
    with the black magic of magnetics, I is duh, so J and K were next.

    Hope This Helps!
  6. JeffM

    JeffM Guest

    I believe that was in honor of Jack Kilby (J.K.) who invented the IC.
    "One of the inventors" or "co-inventor".
    We wouldn't want to dis Bob Noyce (a kinda Newton/Leibniz thing).
  7. Could be, since "i,j,k" are commonly reserved by mathematicians for the
    names of indices.
  8. I read in that Rich Grise <>
    I think it's much more likely that they are just one of the
    mathematicians' favoured pairs of symbols for variables. They are
    particularly used as subscripts for array variables and indexes for
    summations. R and S are another such pair and there is an R-S inside the
    J-K, so the choice of another such pair to describe the more complex
    configuration seems logical.
  9. Jim Thompson

    Jim Thompson Guest

  10. Rich Grise

    Rich Grise Guest

    I was assuming that the "R" was "Reset" and the "S" was "Set." But what
    could "J" and "K" stand for? :)

  11. I read in that Rich Grise <>
    Jog and Kick, of course. What do you think Q and Q-bar stand for? And
    the D in D-type and the T in T-type.
  12. slawc

    slawc Guest

    Jump, Kill
  13. slawc

    slawc Guest

    Jump, Kill
  14. Rich Grise

    Rich Grise Guest

    Quantity. ;-)

  15. Mike

    Mike Guest

    Here's a post from Max Hauser (search for J-K):

    This version seems somewhat more likely that the oft-reported but
    unsupported claim that they stand for Jack Kilby.

    -- Mike --
  16. Joerg

    Joerg Guest

    Hi Mike,
    Could very well be. John Kardash is often mentioned as the inventor of
    the JK flip-flop. I think he is still on the Taracom management team. So
    we could ask him ;-)

    Regards, Joerg
  17. John Miles

    John Miles Guest

    John Kerry?

    -- jm (yeah, I know...)
  18. Max Hauser

    Max Hauser Guest

    Thank you Mike. Those of short memory, hearken `way back to
    21-January and this same topic (some of the same people were
    involved). Following an Old-Fart electronics quiz (re-post from this
    newsgroup 17 years before, when still just sci.electronics). Or,
    search under the name John J. Kardash (he shows up in the "JK FF"
    context a wide range of sources, online and off). The January mention
    here is accessible now via

    and the list of quiz answers is here

    Historical notes: [1] Should anyone actually read the original 1987
    posted answers, please note that the phrase "electronics hackers"
    meant "hackers" in the traditional, or pre-Hollywood, sense (much more
    common in 1987 than today). I heard that exact phrase in 1974 from
    the late professor David Adler who acknowledged "all sorts of
    electronics hackers" at MIT. [2] Correction from January posting:
    Bill Hewlett's lightweight prototype oscillator weighed 18 pounds, not
    14. I lately had reason to check his Stanford thesis of June 1939.
    (The 93-pound state of the art from General Radio was accurate as

    -- Max

    (fiat lux / mens et manus)
  19. Guest

    I cannot believe that with all the politics in this group, no one has pointed
    out that the J-K in a flip flop is:

    J is for John
    K is for Kerry

    Stop hating each other for a few minutes and pay attention :)
  20. Mark Zenier

    Mark Zenier Guest

    Internal schematic of a Bush FF

    | | |
    | +-------|- /Q
    Data | |
    ---------------|-----+ |
    | | |
    Clock | | |
    ---------------|-----+ |
    | | |
    | +-------|- Q
    | | |

    Notes: (1) the outputs appear as valid logic levels but never change.
    (2) Any inputs that can change the output are forced to Ground.

    Mark Zenier Washington State resident
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