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Sequential Logic

Combinational circuits can perform any desired logical operation to take a set of input signals and turn them into an entirely different set of output signals. However, they have a couple of shortcomings: they cannot remember the previous state of their inputs, and they cannot select when to produce their output signals. They simply react to any changes in their inputs by changing their outputs according to their internal logic.

To fill in these missing capabilities, we need a digital memory circuit, and we need the ability to synchronize digital events. Such a circuit can deal with a sequence of digital events, and is therefore known as sequential logic.

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