JK flip flop with direct inputs

Discussion in 'General Electronics Chat' started by SilverKing, Jan 9, 2015.

  1. SilverKing

    Thread Starter Member

    Feb 2, 2014
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    Hi everyone,


    What is the logic circuit of JK flip flop with direct inputs (Clear and Preset)?

    I need the circuit with AND-NOR and NAND combinations if that possible.


    Thanks in advanc>
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
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    Please attempt your own homework, we don't do it for you.
     
  3. crutschow

    Expert

    Mar 14, 2008
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    What JK flip flop? Their characteristics vary with model.

    What do you mean "with AND-NOR and NAND combinations"?
     
  4. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    There you go... why didn't you just google it?

    JK-FlipFlop_(4-NAND).PNG
     
  5. BillB3857

    Senior Member

    Feb 28, 2009
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    My guess is that the OP has the assignment to create the function of a JK-FF using AND, NOR and NAND function blocks and is having difficulty figuring out how to logically represent the DS and DR functions.
     
  6. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    How about this?
    fig179_01.jpg
     
  7. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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  8. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    This oughta do it....

    74ls76_dual_jk_flip-flop_with_preset_and_clear_.jpg
     
    absf likes this.
  9. BillB3857

    Senior Member

    Feb 28, 2009
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    Sure looks good. I'm sure the OP is grateful for someone doing his homework for him,
     
    Lundwall_Paul likes this.
  10. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    :oops: yeaaaaahhhhhhh wellll.... I was bored, really.....
     
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  11. tshuck

    Well-Known Member

    Oct 18, 2012
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    Regardless, we do not give out answers.

    We strive to teach and instruct.

    How can we do this if people simply post the answers?
     
  12. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    Right... I have two children and know exactly what you mean...
     
    tshuck likes this.
  13. cmartinez

    AAC Fanatic!

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    I wonder if the OP will at least say "thank you"....
     
  14. alfacliff

    Well-Known Member

    Dec 13, 2013
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    due to the price and scarcity of ttl chips when I was in school, we had to make up the circuits with discrete parts, that will teach you about the individual circuits. they had one 7400 squad nand gate, and passed it around in a plastic box to show us what they looked like.
     
  15. SilverKing

    Thread Starter Member

    Feb 2, 2014
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    I see a lot of chit-chatting about me being too lazy. Never mind.
    And this is not even an assignment, I just wanna make sure from what I'm studying.

    My problem that is my instructor gave me this circuit:
    http://s9.postimg.org/5625zj7gf/Untitled.png

    I'm not really sure of that. Besides, he didn't gave us any method to convert between AND-NOR and NAND combinations, basically he focuses on the AND-NOR combination.
     
  16. tshuck

    Well-Known Member

    Oct 18, 2012
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    By not trying your own work, you are being lazy. There is no "chit-chat" about it.

    Use the fact that you can make any gate function from NANDs, and replace each gate with its NAND implementation. Then, try to minimize it.
     
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  17. SilverKing

    Thread Starter Member

    Feb 2, 2014
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    How can I try something that I don't even know about? I didn't know that there's a way to convert AND-NOR to NAND only few minutes prior to my reply.

    Anyway, I'll follow what you said and tell how it goes.

    Thanks.
     
  18. tshuck

    Well-Known Member

    Oct 18, 2012
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    Are you saying you were never taught about gate universality or that you can use a NAND gate to make an inverter?
     
  19. SilverKing

    Thread Starter Member

    Feb 2, 2014
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    No, but I was never that the conversion can be applied on sequential circuits, and not only the combinational circuits.
     
  20. tshuck

    Well-Known Member

    Oct 18, 2012
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    Which gates in your diagram are sequential? All I see are 2 OR, 2 AND, and 2 NOT/inverter gates, no sequential logic there...

    They may be arranged in such a way as to become a sequential component, but it is made of combinational parts.
     
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