Half Adder_Digital logic_

About half adder, its working and application

1. Half adder 1 Presented by: Rabin BK BSc.CSIT 2 nd Semester

2. CONTENTS Introduction to Adder What is Half Adder? Half Adder Logic diagram A glimpse at the working of Half adder Application of Half Adder References 2

3. Introduction to Adder A  digital logic circuit in electronics that implements addition of 2 bits Used to calculate addresses and table indices in the ALU and also in other parts of the processors Most commonly, it operate on binary numbers Classified into two types : half adder and full adder 3

4. Half Adder It adds two binary digits The input variables are called augend and addend bits and produces two outputs as sum and carry following simple binary addition The sum and carry are two outputs For an example: 0 + 0 = 0 0 0 + 1 = 1 0 1 + 0 = 1 0 1 + 1 = 0 1 4 Carry ‘C’ Sum ‘S’

5. Half Adder Logic diagram Comprises of XOR gate and AND gate Two input variables are A and B as augend and addend Truth Table is: 5 Augend Addend Output variable Input Output A B S C 1 1 1 1 1 1 1

6. Working of Half adder For the input variables A and B as augend and addend, the Half Adder works as: 6 Input variable Output variable SUM CARRY

7. Application of half adder With the addition of an OR gate to combine their carry outputs, two half adders can be combined to make a full adder 7

8. R eferences Web reference : https:// www.elprocus.com/half-adder-and-full-adder/ https :// upload.wikimedia.org/wikipedia/commons/thumb/9/92/Halfadder.gif/220px-Halfadder.gif http:// theteacher.info/index.php/programming-development-1/2-logical-operations/all-topics/3622-an-application-of-full-adders https://www.google.com.np/url?sa=t&rct=j&q=& esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwihmqX-2pbUAhXHtI8KHa-DF4QFggjMAE&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FAdder _(electronics)& usg=AFQjCNFbLNz08tyf8ay0TMSApHtVnXoDGQ&sig2=5_allA9EWff09dqaizgkCQ https://en.wikipedia.org/wiki/Adder_(electronics ) http:// www.lbpcentral.com/forums/showthread.php?51015-Practical-applications-for-adder-subtraction-circuits-amp-7-bit-registers-e-t-c 8

9. Queries 9