- 31st May 2008, 16:27 #1

- Join Date
- May 2006
- Location
- Bangalore, Karnataka, India
- Posts
- 74
- Helped
- 8 / 8
- Points
- 1,996
- Level
- 10

## Design of Counters using JK flip flops

Hi, I want the procedure to Design of Counters using JK flip flops. I have seen question like, some input & output equations will be given & we should provide the state diagram, state table, state equation & logic (circuit) diagram.

I don't know if its a synchronous or asynchronous?

Bye,

PRAVARDHAN

- 31st May 2008, 16:27

- 1st June 2008, 19:53 #2

- Join Date
- Aug 2004
- Posts
- 237
- Helped
- 22 / 22
- Points
- 3,472
- Level
- 13

## Re: Design of Counters using JK flip flops

this is a bistable multivi brator.

for circuits see this

Added after 27 seconds:

http://www.play-hookey.com/digital/j...flip-flop.html

- 2nd June 2008, 08:23 #3

- Join Date
- Apr 2005
- Posts
- 880
- Helped
- 126 / 126
- Points
- 17,217
- Level
- 31

## Design of Counters using JK flip flops

pravardhan,...

What kind of counters (BCD, binary, Decimal, up-down,...)?

All can be designed using state diagrams and K-Map.

I have a lot of designes, just name the counter and I'll provide you with design.

- 2nd June 2008, 11:27 #4

- Join Date
- Nov 2005
- Location
- Bg
- Posts
- 187
- Helped
- 45 / 45
- Points
- 4,065
- Level
- 15

## Re: Design of Counters using JK flip flops

Try this:

- 2nd June 2008, 11:27

- 2nd June 2008, 16:13 #5

- Join Date
- May 2006
- Location
- Bangalore, Karnataka, India
- Posts
- 74
- Helped
- 8 / 8
- Points
- 1,996
- Level
- 10

## Re: Design of Counters using JK flip flops

Ok, the question is like this:

A sequential circuit has two flip flops (A and B), two inputs (x and y) and an output z. The flip flop functions and the circuit output functions are as follows:

JA = xB+yB' KA = xy'B'

JB = xA' KB = xy'+A

z = xyA+x'y'B

Obtain:

a) logic diagram

b) state table

c) state diagram

d) state equations

The question is taken from the Book:

Digital logic and computer design by Morris Mano.

The page number is 254 & question number is 6-13.

The partial answer is given in page no. 597

But, i couldn't get how he formed the table?

Thanks in advance,

PRAVARDHAN

- 3rd June 2008, 14:59 #6

- Join Date
- Apr 2005
- Posts
- 880
- Helped
- 126 / 126
- Points
- 17,217
- Level
- 31

## Design of Counters using JK flip flops

I'm sorry, but.. What are the (x and y)? The inputs of what?

The two Flip_Flops have (JA,KA,QA,Q'A,JB,KB,QB,Q'B) what are the (x and y)?

- 3rd June 2008, 15:33 #7

- Join Date
- May 2006
- Location
- Bangalore, Karnataka, India
- Posts
- 74
- Helped
- 8 / 8
- Points
- 1,996
- Level
- 10

## Re: Design of Counters using JK flip flops

Hi seadolphine,

Um.. There will be some gates between the Flip-Flops and the two inputs - x & y, as well as at the output.

And, the outputs of flip-flops are A,A',B & B' and the inputs are JA,KA,JB & KB.

Bye,

PRAVARDHAN

- 3rd December 2009, 15:13 #8

- Join Date
- Dec 2009
- Location
- ina
- Posts
- 1
- Helped
- 0 / 0
- Points
- 539
- Level
- 4

## Re: Design of Counters using JK flip flops

Originally Posted by**seadolphine2000**

can you provide me a design of counter up and down 0-99/99-0 ???

:D

- 20th December 2009, 19:01 #9

- Join Date
- Dec 2009
- Location
- USA
- Posts
- 46
- Helped
- 4 / 4
- Points
- 830
- Level
- 6

## Re: Design of Counters using JK flip flops

The following link shows you not only how to design the multivibrator circuit but also how to present the work:

http://www.teahlab.com/multivibrator...rslaveff.html#

Let me know if you have more questions.