Experiment 10 - The JK Flip-Flop

Until now you have met two classes of flip-flops: the RS and the D flip-flop. The biggest difference between them is the number of inputs and how you switch between the states. Here you will learn about a new class of flip-flops: The JK flip-flop.

The JK flip-flop is very similar to the RS flip-flop. The J input behaves like the S input, the K input like the R input. The only difference is when J and K simultaneously switch to 1. In an RS flip-flop the result in this case is not defined.

In a JK flip-flop on the other hand, when J and K are both equal to 1, the result changes for each Clk pulse.

This you can discover for yourself. Use the C-MOS IC 4027, on which you find a preprogrammed JK flip-flop...

Symbol JK Flip-Flop in Circuit Diagrams.

Circuit of a JK Flip-Flops. (Enlarge)

In the next experiment, you learn about yet another class of flip-flops.