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CHAPTER 14 SEMICONDUCTORS

Logic gates

1. NOR gate: It has two or more inputs and one output. A NOT- operation applied after OR gate gives a NOT-OR gate (or simply NOR gate). Its output Y is ‘1’ only when both inputs A and B are ‘0’, i.e., neither of the inputs is ‘1’. NOR gates are considered as universal gates because we can obtain all the gates like AND, OR, NOT by using only NOR gates.
 Symbol Truth Table NOR gate Input Output A B Y 0 0 1 0 1 0 1 0 0 1 1 0