HELP understanding JK circuit

Thread Starter

DaffyD

Joined Sep 24, 2008
3
I don't understand how a JK flip flop series works. There is a series of 4 circuits all attached to a clock. The starting value is 0000.

I need to trace it and tell what it does. Diagram is attached.
 

Attachments

Last edited:

beenthere

Joined Apr 20, 2004
15,819
Further hint - if the Q outputs are 0, what must the ^Q outputs be? What happens when you clock the flip flops based on the inputs?
 

Thread Starter

DaffyD

Joined Sep 24, 2008
3
Okay, here is what I don't understand specifically. When the clock pulses, does it toggle J or K or both? Or does it toggle J on the rising edge and K on the falling edge? Thanks for your help.
 

beenthere

Joined Apr 20, 2004
15,819
Have you looked at a truth table for a J-K flip flop? The state toggles based on the state of the J and K inputs. Get a data sheet for a 7472 to see how they work.
 
Top