Decoder n-data Inputs possible outputs Enable Inputs ypIcal ecoder
Decoder Typical decoder Enable inputs n-data inputs 2 n possible outputs
D ecoder a Decoder can be used as minterm or maxterm generators 口TT74x×138 3-t0-8 decoder multiple 3-to -8 decoders can be cascaded to form 4-to-16 or even large decoders
Decoder Decoder can be used as minterm or maxterm generators. TTL74xx138 ◼ 3-to-8 decoder ◼ multiple 3-to -8 decoders can be cascaded to form 4-to-16 or even large decoders
D ecoder 口F(A,B,C) =TM(0,1,2,4,7) ABc YO Y1 口F(A,BC) Y2 =∑m(2457 Y3 Y4 >To 74LS138 G1 Y5 G2A Y6 yi corresponds to Maxterm i G2B Y7 yⅰ=Mi 74Ls138
Decoder F(A,B,C) =∏M(0,1,2,4,7); F(A,B,C) =∑m(2,4,5,7); A B C G1 G2A’ G2B’ Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 74LS138 ►To 74LS138 ►Yi corresponds to Maxterm i. ►Yi=Mi
D ecoder 口F(A,BC)=TM(0,1,2,4,7 ABc YO ABc F Y1 Y2 Y3 o Y4 G1 YaO 0-- G2A Y6O 0_G2B Y7 74Ls138
Decoder F(A,B,C) =∏M(0,1,2,4,7); A B C G1 G2A’ G2B’ Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 74LS138 F A B C 1 0 0
D ecoder 口F(A,BC)=zm(245,7)TM(0,1,36) YO F Bc ABc Y2 Y3 Y4 P G1 Y5 o 0--G2A Y6 G2B Y7 74Ls138
Decoder F(A,B,C) =∑m(2,4,5,7)=∏M(0,1,3,6); A B C G1 G2A’ G2B’ Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 74LS138 F A B C 1 0 0