ECE 2110: Introduction to Digital Systems Chapter 6 Combinational Logic Design Practices Multiplexers.

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ECE 2110: Introduction to Digital Systems Chapter 6 Combinational Logic Design Practices Multiplexers

Multiplexers (Mux) Select one of n sources of data to transmit on a bus. E.g. Put between Processor’s registers and ALU A 16-bit processor where 3-bit field specifies one of 8 registers. The 3-bit field is connected to the select inputs of an 8-input, 16-bit Mux.

MSI: 74x151 8-input 1-bit multiplexer

74x151 truth table

Other multiplexer varieties 2-input, 4-bit-wide  74x157 4-input, 2-bit- wide  74x153

Expanding Multiplexers 32-to-1 Mux

Demultiplexers same as decoders A Mux is used to select one of n sources of data to transmit on a bus. A demultiplexer can be used to route the bus data to one of m destinations. Just the inverse of a mux. A binary decoder with an enable input can be used as a Demux. E.g. 74x139 can be used as a 2-bit, 4- output Demux.

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