Experiment 11 - The T Flip-Flop

In digital electronics one speaks of four classes of flip-flops. So far you have met three classes by now. The last class is the so-called T flip-flop.

The T flip-flop has next to the Clk input also the T or Toggle input...

• As long as the T is set to 1, the flip-flop switches at each rising edge of Clk between the results.
• If T = 0, the result is stored.

Symbol T Flip-Flop in a Circuit Diagram.

Circuit of a T Flip-Flops. (Enlarge)

This sounds probably familiar to you. Remember the JK flip-flop from the last experiment...

• If J = K = 1, the flip-flop switches at each rising edge of Clk between the results.
• If J = K = 0, the result is stored.

So you only need to ensure that J is always the same than K. The easiest way is by connecting the push-button T to the inputs J and K.

You can therefore use the JK flip-flop circuit from the last experiment.