1 votes 1 votes Can a 4:1 MUX operate as 2:1? (I understand 4:1 can be realized using 2:1 Mux but is reverse possible, may be by grounding?) Digital Logic digital-logic digital-circuits + – Warlock lord asked Apr 19, 2018 Warlock lord 427 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply ankitgupta.1729 commented Apr 19, 2018 reply Follow Share I think , we can do.. suppose for 4 : 1 MUX , select lines are S0 and S1 and inputs are A,B,C and D , then o/p will be F(A,B,C,D) = S0'S1'A + S0'S1B + S0S1'C + S0S1D Now , put C ,D and S0 as zero means give zero voltage signals to these inputs (or) grounded them. Then it becomes F(A,B) = S1'A + S1B which is equivalent to output of 2:1 MUX for select line S1 and Inputs A and B. 0 votes 0 votes Warlock lord commented Apr 19, 2018 reply Follow Share Yes I thought so too. Can you please visit this link: https://gateoverflow.in/212817/pgee-sample-paper Shouldn't the answer then be A,B,C,D? 0 votes 0 votes Please log in or register to add a comment.