5. Sequential logic circuits

A sequential circuit is a digital circuit whose output depends not only on the current value of its input signals but also on a series of previous inputs. Its output is also often controlled by clocks, which we presented in the last chapter. The sequential circuits of our particular interest are flip-flops and counters. All those circuits have the ability to permanently store the state so we will first realize simple circuits as primitive transistor memory. Then we will use NOR and NAND logic gates to create latch and flip-flop types of memory. Finally, we will introduce counters.

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