# Design a counter using JK flip flops

Discussion in 'Homework Help' started by slider203, Jan 18, 2010.

1. ### slider203 Thread Starter New Member

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Jan 18, 2010
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Hello I am doing the grade 11 computer engeneering course and I was doing my homework when I got stuck on a question that says "Design a counter using J-K flip flops that will count in the following sequence: 0,2,5,1,3" would some one please help a newbie like my self make this counter. I have been trying for hours and still dont know how to do it.
Thanks any help is apperciated

EDIT: beenthere first we have to create a truth table (I did that)

t t+1
Q2 Q1 Q0 Q2 Q1 Q0
0 0 0 0 1 0
0 1 0 1 0 1
1 0 1 0 0 1
0 0 1 0 1 1
1 1 1 0 0 0

then we had 2 draw truth tables did that too.
but then we have to make the truth tables into a diagram thats were Im getting stuck...this is what the diagram looks like:
____________ __________ ___________
|J2 Q2 | |J1 Q1| |J0 Q0|
| | | | | |
O>CLK | O>CLK | O>CLK |
| _ | | _ | | _ |
| K2 Q2| |K1 Q1 | |K0 Q0 |
--------------- ------------- -------------
(I know its a bit rough but you get the idea..I hope)

Last edited: Jan 19, 2010
2. ### beenthere Retired Moderator

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Can you show us your work? We may be able to see where you got stuck.

3. ### t06afre AAC Fanatic!

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try Google and the term karnaugh synchronus counter. This should get you started

4. ### knowitall New Member

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Are you allowed to use any additional componants, like diodes or decoders,or a reset switch?

5. ### slider203 Thread Starter New Member

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Jan 18, 2010
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we can use a reset switch also we are using the chips 7490, 7992, 7493

6. ### beenthere Retired Moderator

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Get the data sheets for those chips - you might be surprised to see what they are. Google "sn7490", sn7492, sn7493" and follow the links for the data sheets.