# Logic Gates – Types, Working Principle, Application, Advantage

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## What are Logic Gates

#### Fig.2 below shows an example of Logic Gate circuit which has three inputs A, B, C and single output Y. ## Types of Logic Gates

### NOT Gate (Inverter)

#### The output of NOT Gate is ‘High’ if the input is ‘Low’ and Vice versa. ### AND Gate (Multiplication)

#### The output of AND Gate is ‘High’ if both the inputs are High and the output is ‘Low’ if both or either of the inputs is ‘Low’. #### The output of OR Gate is ‘High’ if both the inputs are ‘High’ or one of the inputs is ‘High’. The output is ‘Low’ if both the inputs are ‘Low’. ### NAND Gate

#### The output of NAND Gate is ‘High’ if both the inputs are ‘Low’ and if either of the input is ‘Low’. The output is ‘Low’ if both the inputs are ‘High’ ### NOR Gate

#### The output of NOR Gate is ‘High’ if both the inputs are ‘Low’. The output is ‘Low’ if both the inputs are ‘High’ or either of the input is ‘High’ ### XOR Gate

#### The output of XOR Gate is ‘High’ if either of the input is ‘High’. The output is ‘Low’ if both the inputs are ‘High’ or if both the inputs are ‘Low’. ### XNOR Gate

#### The output of XNOR Gate is ‘High’ if both the inputs are ‘High’ or if both the inputs are ‘Low’. The output is ‘Low’ if either of the input is ‘Low’ ## Working Principle of Logic Gates

#### Based on this, we can prepare a Truth Table as shown in Fig. 10 