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,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,5.7 Multiplexers,Return,Next,Multiplexers,(,mux,),A,multiplexer,is a digital switch,it connects data from one of n sources to its output.,D0,D1,Dn,Y,SEL,EN,.,1D0,1D1,1Dn,1Y,SEL,EN,.,2D0,2D1,2Dn,2Y,.,3D0,3D1,3Dn,3Y,.,An n-input, b-bit,multiplexer, its output is,M,j,represents miniterm,j,of the,s,select inputs.,1,5.7 Multiplexers,Next,Back,Return,Standard MSI,Multiplexers,74x151,EN,A,B,C Y,D0,D1 Y,D2,D3,D4,D5,D6,D7,74X151,5,4,7,11,10,9,3,2,1,15,6,14,13,12,0 1,D0 D0,D1 D1,D2 D2,D3 D3,D4 D4,D5 D5,D6 D6,D7 D7,1 x x x,0 0 0 0,0 0 0 1,0 0 1 0,0 0 1 1,0 1 0 0,0 1 0 1,0 1 1 0,0 1 1 1,Y Y,EN C B A,Outputs,Inputs,2,5.7 Multiplexers,Next,Back,Return,0 0 0 0,1A 2A 3A 4A,1B 2B 3B 4B,1 x,0 0,0 1,1Y 2Y 3Y 4Y,G S,Outputs,Inputs,G,S,1A,1B 1Y,2A 2Y,2B 3Y,3A 4Y,3B,4A,4B,74X157,4,5,15,1,2,3,6,11,10,14,9,13,7,12,74x157,3,5.7 Multiplexers,Next,Back,Return,74x153,A,B,1G,1C0 1Y,1C1,1C2 2Y,1C3,2G,2C0,2C1,2C2,2C3,74X153,7,5,14,2,1,6,4,3,15,10,9,11,12,13,1C0 2C0,1C1 2C1,1C2 2C2,1C3 2C3,1C0 0,1C1 0,1C2 0,1C3 0,0 2C0,0 2C1,0 2C2,0 2C3,0 0,0 0 0 0,0 0 0 1,0 0 1 0,0 0 1 1,0 1 0 0,0 1 0 1,0 1 1 0,0 1 1 1,1 0 0 0,1 0 0 1,1 0 1 0,1 0 1 1,1 1 X X,1Y 2Y,1G 2G B A,Outputs,Inputs,4,5.7 Multiplexers,Expanding,Multiplexers,(P403 Figure 5-66),Multiplexers,Demultiplexers, and Buses,A multiplexer can be used to select one of,n,sources of data to transmit on a bus. At the far end of the bus, a demultiplexer can be used to route the bus data to one of,m,destinations. (P404 figure 5-67),A binary decoder with an enable input can be used as a demultiplexer, such as a 74X138 or a 74x139.,Back,Return,5,
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