# Flip Flop Characteristic Equations

Discussion in 'Homework Help' started by n0th1n2b3sa1d, May 27, 2009.

1. ### n0th1n2b3sa1d Thread Starter New Member

May 27, 2009
4
0
An easy one.

I just try to understand how I can write a flip flop's characteristic equation with using its characteristic table ?

Could you explain how can i implement J K flip flop characteristic equation, with using J K flip flop characteristic table ?

http://faculty.kfupm.edu.sa/COE/ash.../COE022_200/Chapter4_1_files/jk-flip-flop.gif

My major job is about implementing the characteristic equations of custom(user defined) flip flops, whose characteristic table is given. I thought that J K ff would be a good example for me.

Thanks.

2. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
Do you mean a truth table? Could you explain what you mean by -

3. ### n0th1n2b3sa1d Thread Starter New Member

May 27, 2009
4
0
for example i have a 2 input flip flop which is states are :
when 1, 1 = set state;
when 1, 0 = reset state;
when 0, 1 = complement;
when 0, 0 = no change.

i can draw its characteristic table, but i don't know how to get characteristic equation from its characteristic table.

4. ### n0th1n2b3sa1d Thread Starter New Member

May 27, 2009
4
0
By the way, yes. I meant the truth table, which belongs to characteristic equation.

5. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
You may notice that there is also a clock input involved. Your typical J - K flip flop does not operate according to you table. You will need some external gates to control the J and K inputs so the flip flop will act as you wish.

Look up the data sheet for a 74XX73 to see how a J - K operates.

May 27, 2009
4
0
thank you.