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EEE 441 LOGICAL DESIGN II LABORATORY

EXPERIMENT#5

ELEMENTARY GATE NETWORKS

QUESTIONS

Mehmet BAYRAM 9610433

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I. QUESTIONS

1. Multiplexing means transmitting a large number of information units over a

smaller number of channels or lines. A digital multiplexer is combinational circuit that selects binary information from one of many input lines and directs it to a single output line. The selection of a particular input line is controlled by a set of selection lines. Normally, there are 2n input lines and n selection lines whose bit combinations determine which input is selected.

S1 S2 S3 Output y 0 0 0 Select A 0 0 1 Select B 0 1 0 Select C 0 1 1 Select D 1 0 0 Select E 1 0 1 Select F 1 1 0 Select G 1 1 1 Select H

Number of Input 8=23 3 selection lines Number of Input 16=24 4 selection lines Number of Input 32=25 5 selection lines

2. We must use 4 mux which ve found in Q1 and we use 2 selection lines

S1 S2 Output 0 0 Select 1st mux 0 1 Select 2nd mux1 0 Select 3rd mux 1 1 Select 4th mux

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0 1

23 2 3

22 4x10 4 decoder 5

21 6 7

20 8 9

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