Demultiplexer

Demultiplexer A Demultiplexer (DMUX) is a circuit that receives a signal on a single input line and directs that
signal to one of 2n possible output lines. If the enable input is active, we can also call this circuit a
n-to2n Decoder. A block diagram of 1-to-4 line Demultiplexer is shown in Fig. 5a. A functional logic
diagram for the device is shown in Fig. 5b and truth table for it is shown in Fig. 6.
Like Multiplexers, smaller Demultiplexers can also be connected together to obtain larger
configuration. Fig. 7 illustrates in block diagram form how five 1-to-4 line Demultiplexers can be
connected to obtain a 1-to-16 line Demultiplexer. Observe that ENABLE signal is activated when
input line is high (instead of Demultiplexer shown in Fig. 5).
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