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Swiittchiing deviices and ciircuiitts The switching devices posses the property of having associated with them two distinct physical
states. The actual signal values of these states differ from one device to another upon their
design, but still these devices are controlled by two-valued signals and are capable of producing
two-valued signals.
If a circuit is constructed of such bi-stable devices, it is capable of receiving two-valued signals at
its input and producing two-valued signals on its output. Such a circuit is called a switching circuit.
Any switching circuit can be represented by the switching functions of its outputs. On the other
hand, the switching circuit can implement a switching function.
If the output values of the circuit are at any time determined strictly by the inputs at that time, such
circuit is called a combinational circuit.
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