The output of an OR gate is true (logic 1) if any or all of the inputs are true (logic 1). The OR gate can be illustrated with a parallel connection of manual switches or transistor switches.
The Boolean Expression for a two input OR gate is X = A + B. The OR operation is shown with a plus sign (+) between the variables. Thus, the OR operation is written as X = A + B.
The only time the output of an OR gate is low is when all the inputs are low.
Example waveform:
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Date last modified: January 17, 2013.
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