Universal Gates

Universal Gates-

 

  • Universal gates are the logic gates which are capable of implementing any Boolean function without requiring any other type of gate.
  • Because universal gates can realize all the binary operations and all the basic logic gates can be derived from them, that is why they are called as “Universal Gates“.

 

Properties of Universal Gates-

 

  • Universal gates are not associative in nature.
  • Universal gates are commutative in nature.

 

Types of Universal Gates-

 

In digital electronics, there are only two universal gates which are-

  1. NAND Gate
  2. NOR Gate

 

1. NAND Gate-

 

NAND Gate is constructed by connecting a NOT Gate at the output terminal of the AND Gate. So,

 

Remember-

NAND Gate = AND Gate + NOT Gate

 

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

 

Logic Symbol-

 

 

Truth Table-

 

ABY = (A.B)’
001
011
101
110

 

Timing Diagram-

 

 

2. NOR Gate-

 

NOR Gate is constructed by connecting a NOT Gate at the output terminal of the OR Gate. So,

 

Remember-

NOR Gate = OR Gate + NOT Gate

 

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

 

Logic Symbol-

 

 

Truth Table-

 

ABY = A + B
001
010
100
110

 

Timing Diagram-

 

 

 

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Summary
Universal Gates
Article Name
Universal Gates
Description
In digital electronics, universal gates are the logic gates which are capable of implementing any Boolean function without requiring any other type of gate. NAND and NOR gates are two the universal gates.
Author
Publisher Name
Gate Vidyalay
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