Logical Gates sneha Topics to be Discussed Gates

Logical Gates sneha

Topics to be Discussed Gates Characteristics of gates Basic Gates AND Gate OR gate NOT gate XOR Gate XNOR gate Universal Gate NAND GATE NAND gate as an Universal gate NOR as an Universal gate Summary

Gates are the basic elements of circuit. A gate is a device that performs a basic operation on electrical signals Gates are combined into circuits to perform more complicated tasks. back

Characteristics of gates Each logic gate has only one binary output. Each logic gate has either one or more than one binary input(s). back

Basic Gates There are three basic gates 1 AND gate 2 OR gate 3 NOT gate back

AND Gate An AND gate has two or more inputs and only one output. The output of an AND gate is 1 only if all inputs are 1. back

OR gate An OR gate has two or more inputs and only one output. The output of an OR gate is 1 only if one or more inputs are 1. back

NOT gate has one input and one output. It is also known as inverter. back

XOR Gate XOR, or exclusive OR, gate ◦ An XOR gate produces 0 if its two inputs are the same, and a 1 otherwise back

XNOR gate It is also known as equivalence gate. It is combination of XOR and NOT gate. Symbol

Cont…. Expression : AB+A’B’ Truth table back A B C 0 0 1 0 1 0 0 1 1 1

Universal Gate A universal gate is that gate which apart from its own logical function can also perform the basic gate function i. e AND, OR and NOT. NAND and NOR are universal gate. back

NAND GATE Nand gate is combination of NOT and AND gate. Symbol Expression : A. B

Truth table back A B S 0 0 1 1 1 0

NAND gate as an Universal gate A NOT gate can be implemented using a NAND gate (a). An AND gate can be implemented using NAND gates (b). An OR gate can be implemented using NAND gates back

NOR gate is combination of OR gate and NOT gate. Symbol back

NOR as an Universal gate back

Summary

Summary for all 2 -input gates Inputs Output of each gate A B AND NAND OR NOR XNOR 0 0 0 1 0 1 0 1 0 0 1 1 1 0 0 1 back