# 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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0
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.

Oct 18, 2012
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3. ### crutschow Expert

Mar 14, 2008
13,501
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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
3,698
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There you go... why didn't you just google it?

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.

Jan 17, 2007
3,698
2,790

Jan 17, 2007
3,698
2,790
8. ### cmartinez AAC Fanatic!

Jan 17, 2007
3,698
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This oughta do it....

absf likes this.
9. ### BillB3857 Senior Member

Feb 28, 2009
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348
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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yeaaaaahhhhhhh wellll.... I was bored, really.....

Lundwall_Paul likes this.
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
3,698
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Right... I have two children and know exactly what you mean...

tshuck likes this.
13. ### cmartinez AAC Fanatic!

Jan 17, 2007
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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
72
0
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
3,531
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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
72
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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
72
0
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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675
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.