Combinational Logic


Circuits in which all outputs at any given time depend only on the inputs at that time are called
combinationallogic circuits.

A combinational circuit performs a specific information-processing operation fully specified
logically by a set of Boolean functions. Sequential circuits employ memory elements (binary
cells) in addition to logic gates. Their outputs are a function of the inputs and the state of the
memory elements. The state of memory elements, in turn, is a function of previous inputs. As a
consequence, the outputs of a sequential circuit depend not only on present inputs, but also
on past inputs, and the circuit behavior must be specified by a time sequence of inputs and
internal states.

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