# Electronics/Basic gates

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## Basic Gates[edit]

There are 5 basic gates used in performing logic operations in Digital Electronic namely BUFFER gate, NOT gate, AND gate, OR gate, XOR gate . Each Logic Gate has A Symbol for easy to identify , a Mathematical Expression to identify mathmatic logic operation and a Truth Table to completely describe operation of the Logic Gate

## Five Basic Logic Gates[edit]

Digital gates Symbol Logic Operation Mathematic Expression BUFFER Y = BUFFER A Y = A NOT Y = NOT A Y = AND Y = A AND B Y = A . B OR Y = A OR B Y = A + B XOR Y = A XOR B Y =

The Truth Table of the five basic logic gates above

A B Q = A Q = NOT A Q = A AND B Q = A OR B Q = A XOR B 0 0 0 1 0 0 0 0 1 0 1 0 1 1 1 0 1 0 0 1 1 1 1 1 0 1 1 0

## Complement of Basic Logic gates[edit]

Basic Gates Combination Gates Symbol Mathematical Expression BUFFER Q = is NOT NOT A

Y = ANOT Y = is NOT A NAND Q = NOT A AND B NOR Y = NOT A OR B XNOR Q = NOT A XOR B

The Truth table of the combination gates above

A B Q = A Q = NOT A Q = A NAND B Q = A NOR B Q = A XNOR B 0 0 0 1 1 1 1 0 1 0 1 1 0 0 1 0 1 0 1 0 0 1 1 1 0 0 0 1

## Summary[edit]

Gates Function Symbol ANSI IEC Buffer NOT gate (Inverter) AND gate NAND gate (NOT−AND) OR gate NOR gate (NOT−OR) XOR gate (Exclusive-OR) XNOR gate (NOT−exclusive−OR)

A B Q = A Q = NOT A Q = A AND B Q = A OR B Q = A XOR B Q = A NAND B Q = A NOR B Q = A XNOR B 0 0 0 1 0 0 0 1 1 1 0 1 0 1 0 1 1 1 0 0 1 0 1 0 0 1 1 1 0 0 1 1 1 0 1 1 0 0 0 1