Logic Gates | Definitions | Types | Symbols | Truth Tables

Logic Gates-

 

Logic Gates may be defined as-

 

Logic gates are the digital circuits capable of performing a particular logic function

by operating on a number of binary inputs.

OR

Logic gates are the basic building blocks of any digital circuit.

Types Of Logic Gates-

 

Logic gates can be broadly classified as-

 

 

In this article, we will discuss about Basic Logic Gates.

 

Basic Logic Gates-

 

Basic Logic Gates are the fundamental logic gates using which universal logic gates and other logic gates are constructed.

 

They have the following properties-

  • Basic logic gates are associative in nature.
  • Basic logic gates are commutative in nature.

 

There are following three basic logic gates-

  1. AND Gate
  2. OR Gate
  3. NOT Gate

 

1. AND Gate-

 

  • The output of AND gate is high (‘1’) if all of its inputs are high (‘1’).
  • The output of AND gate is low (‘0’) if any one of its inputs is low (‘0’).

 

Logic Symbol-

 

The logic symbol for AND Gate is as shown below-

 

 

Truth Table-

 

The truth table for AND Gate is as shown below-

 

ABY = A.B
000
010
100
111

 

Timing Diagram-

 

The timing diagram for AND Gate is as shown below-

 

 

2. OR Gate-

 

  • The output of OR gate is high (‘1’) if any one of its inputs is high (‘1’).
  • The output of OR gate is low (‘0’) if all of its inputs are low (‘0’).

 

Logic Symbol-

 

The logic symbol for OR Gate is as shown below-

 

 

Truth Table-

 

The truth table for OR Gate is as shown below-

 

ABY = A + B
000
011
101
111

 

Timing Diagram-

 

The timing diagram for OR Gate is as shown below-

 

 

3. NOT Gate-

 

  • The output of NOT gate is high (‘1’) if its input is low (‘0’).
  • The output of NOT gate is low (‘0’) if its input is high (‘1’).

 

From here-

  • It is clear that NOT gate simply inverts the given input.
  • Since NOT gate simply inverts the given input, therefore it is also known as Inverter Gate.

 

Logic Symbol-

 

The logic symbol for OR Gate is as shown below-

 

 

Truth Table-

 

The truth table for NOT Gate is as shown below-

 

AY = A’
01
10

 

Timing Diagram-

 

The timing diagram for NOT Gate is as shown below-

 

 

Next Article- Universal Logic Gates

 

Get more notes and other study material of Digital Design.

Watch video lectures by visiting our YouTube channel LearnVidFun.

Summary
Logic Gates | Definitions | Types | Symbols | Truth Tables
Article Name
Logic Gates | Definitions | Types | Symbols | Truth Tables
Description
Logic gates are the basic building blocks of any digital circuit. Logic Gates Definitions, Types, Symbols and Truth Tables are discussed. There are 3 basic types of logic gates AND Gate, OR Gate, NOT Gate.
Author
Publisher Name
Gate Vidyalay
Publisher Logo
Liked this article? Share it with your friends and classmates now-