ABSTRACT

Because in a sequential network the outputs assume values depending not only on the current values but also on some past values of the inputs, a sequential network must remember information about the past values of its inputs. Simple networks called

flip-flops

that are realized with logic gates are usually used as memories for this purpose. Semiconductor memories can also serve as memories for sequential networks, but flip-flops are used if higher speed is necessary to match the speed of logic gates. Let us explain the simplest flip-flops, which are called

latches

.