68 votes 68 votes Minimum No of Gates NAND/NOR Ex-OR Ex-Nor Half Adder Half Subtractor Full Adder Full Subtractor NAND ? ? ? ? ? ? NOR ? ? ? ? ? ? Digital Logic digital-logic min-no-gates + – bahirNaik asked Dec 17, 2015 • retagged May 27, 2021 by Shiva Sagar Rao bahirNaik 82.7k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 117 votes 117 votes Minimum Number of Gates: Nand/Nor Exor Exnor Half Adder Half Subtractor Full Adder Full Subtractor $NAND$ $4$ $5$ $5$ $5$ $9$ $9$ $NOR$ $5$ $4$ $5$ $5$ $9$ $9$ Exor Using Nand Gates Exor Using Nor Gates Ex-Nor using Nand Gates Ex-Nor using Nor Gates Half Adder using Nand Gates Half Adder Using Nor Gates Half Subtractor using Nand Gates Half Subtractor using Nor gates Full Adder using Nand Gates Full Adder using Nor gates Full Subtractor using Nand Gates Full Subtractor using Nor Gates Praveen Saini answered Dec 19, 2015 • selected Dec 19, 2015 by bahirNaik Praveen Saini comment Share Follow See all 11 Comments See all 11 11 Comments reply bahirNaik commented Dec 19, 2015 reply Follow Share Thanks a ton sir ! that made life easy :) 1 votes 1 votes Ravi_1511 commented Nov 18, 2016 reply Follow Share thanx.. and so half adder and half subtractor at the same time can be constructed with 6 NAND gates. 0 votes 0 votes rahul sharma 5 commented Dec 21, 2016 reply Follow Share Very nicely explained. Thumbs up. I have been looking for this since long. 2 votes 2 votes mahbub commented Aug 9, 2017 reply Follow Share Thank u sir ...very nice implementation:-) 0 votes 0 votes hem chandra joshi commented Dec 15, 2017 reply Follow Share I found full subtractor using nor gates is 12 http://www.circuitstoday.com/ripple-carry-adder 0 votes 0 votes Sindhurohit commented Dec 28, 2017 reply Follow Share Thanks for your information 0 votes 0 votes SaiSameera commented Jun 21, 2018 reply Follow Share Thanks a lot 0 votes 0 votes KavyaMurugan M commented Sep 6, 2018 reply Follow Share Thank you so much sir 0 votes 0 votes Prince Sindhiya commented Oct 6, 2018 reply Follow Share best explained 0 votes 0 votes srestha commented Aug 10, 2019 reply Follow Share @Praveen Saini Sir If complement also present , then only $3$ NOR gates for EX-NOR right?? like , for $A$ and $B$ input $\left ( AB'+A'B \right )'$=> $3$ NOR gates. Lessthan $3$ not possible. right?? 0 votes 0 votes Praveen Saini commented Aug 10, 2019 reply Follow Share @srestha right. 1 votes 1 votes Please log in or register to add a comment.
2 votes 2 votes EX-OR EX-NOR HALF ADD HALF SUB FULL ADD FULL SUB NAND 4 5 5 5 9 9 NOR 5 4 5 5 12 12 James avula answered Aug 21, 2018 James avula comment Share Follow See all 0 reply Please log in or register to add a comment.
2 votes 2 votes gates nand nor not 1 1 and 2 3 or 3 2 xor 4 5 exnor 5 4 This is the best TIPS: If they ask NAND gates, use Sum of Products If they ask NOR gates, use Product of sums Goodbye shashankrustagi answered Feb 9, 2021 shashankrustagi comment Share Follow See 1 comment See all 1 1 comment reply Gatestriver commented Aug 16, 2022 reply Follow Share How to use these tips 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes EX- OR : 4 NAND, 5 NOR EX- NOR: 5 NAND, 4 NOR Half Adder, Half Subtractor: 5 NAND, 5 NOR Full Adder, Full Subtractor: 9 NAND, 9 NOR RoyArun answered Apr 18, 2020 RoyArun comment Share Follow See all 0 reply Please log in or register to add a comment.