OR GATE

logic symbol for an OR gate.

An oR gate produces a 1 output if any of its inputs are 1s. The output is a 0 if all the inputs are 0s. The output of a two-input OR gate is shown in the below truth table.

Truth table for a two-input OR gate.

An OR gate performs the basic operation of addition. The algebraic expression for the output of an OR gate is Y= A + B. The plus sign designates the OR function.

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