Logic gates are the based building blocks of any digital system. They are usually constructed in LSI and VLSI circuits along with other devices.
It is an electronic circuit having one or more than one input and only one output. The relationship between the input and output is based on a certain logic.
Each input and output have one of the two binary conditions, false and true or LOW and HIGH, false or low represents ‘0’, and true HIGH represents 1.
The function of each logic gate will be represented by Boolean expression.
Truth table: It a means for describing how a logic circuits output depends on the logic levels present at the inputs.
For an “N-input”, there will be 2N number of output combinations.
Logic gates are classified as
– Basic Gates : NOT, AND, OR.
– Universal Gates : NAND, NOR
– Special purpose Gate : EX-OR, EX-NOR.
