Digital Systems: Principles and Design

227Binary Arithmetic and Decoding and Mux Logic Units

10.4 MULTIPLEXER

A multiplexer is a circuit that selects a input line among the input lines as per the channel-

selector logic-inputs and gives that at the output. A multiplexer selects a unique input line

according to the channel selector inputs to it.

10.4.1 Multiplexer (Line Selector)

Let us assume that we have two logic circuits that provide the outputs. One I

1

is for a logic

function F

1

and other I

2

is for F

2

. We have to select only one by giving appropriate instruc-

tion. A multiplexer will select for the output only one. Figure 10.9(a) shows a 2-channel

input-selector 2 to 1 multiplexer with ...