Experiment 23 - Asynchronous Inputs of a Gated D Latch

In this experiment you expand the gated D latch by two inputs SET and RESET . With these inputs, you are also able to control the latch...

In the circuit shown you have replaced two NAND gates by NAND gates with three inputs.

Circuit diagram asynchronous inputs SET and RESET of a gated D Latch.

With these new inputs SET and RESET you can control the state of the gated D latch regardless of the state of the input E ...

• SET sets Q = 1.
• RESET sets Q = 0.

Circuit diagram asynchronous inputs SET and RESET of a gated D latch. (Enlarge)

These inputs are called asynchronous inputs, because you can use them anytime...

To clarify this even more take a look at the next experiment...