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Digital ElectronicsDigital Electronics
Electronics TechnologyElectronics Technology
Landon Johnson
Multiplexers
Demultiplexers
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Mux/Demux CompetenciesMux/Demux Competencies
47. Given 2 logic symbols, the student will identify themultiplexo !nd demultiplexo with "##$ !ccu!cy.
4%. Given fou di&eent input combin!tions to !n %to " multiplexo, the student will st!te the outputlogic levels fo e!ch input combin!tion with "##$
!ccu!cy.4'. Given fou di&eent input combin!tions to ! " to% demultiplexo, the student will st!te the outputlogic levels fo e!ch input combin!tion with "##$!ccu!cy.(#. Given ! )oole!n e*u!tion the student will d!w !multiplexo cicuit th!t will implement this function with
"##$ !ccu!cy.
(". Given ! )oole!n e*u!tion the student will d!w !demultiplexo cicuit th!t will implement this functionwith "##$ !ccu!cy.
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Mux/Demux +oc!bul!yMux/Demux +oc!bul!y
MULTIPLEXER (aka DATA SELET!R"# $ir$uit that $an sele$t one o%
a num&er o% inputs and pass the lo'i$ leel o% that input to the output)
DEMULTIPLEXER (aka DATA DISTRI*UT!R"# $ir$uit that dependin' on
the status o% its sele$t inputs +ill $hannel its data input to one o% seeral
outputs)
SELET I,PUTS (aka ADDRESS LI,ES"# used &- the mux to determine
+hi$h data inputs +ill &e s+it$hed to the output)
lines select N linesinput if N
=
2
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)-C 0135 M56689)-C 0135 M56689
DATA
INPUT S
I1
I0
S
SELECT INPUT
S I S I Z ⋅+⋅=10
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:15935 M56689:15935 M56689
S0S1
I0
I1
I2
I3
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%to" 3C1D9%to" 3C1D9
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M56689 61GC DG9MM56689 61GC DG9M
I 0
I1
I2
I3
I4
I5
I 6
I7
ES
2 S
1 S
0
74151
MUX
D
A
T
A
I
N
P
UT
S
SELECT LINES
Z _
Z
•Takes one o% man- inputs and %unnels it to an output .)
•Take the sele$tor lines $onert to a de$imal num&er and this is the
input %unneled to the output)
•Stro&e is a$tie lo+ ena&le
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M56689 6C13-M56689 6C13-
•DATA R!UTI,/
•PARALLEL#T!#SERIAL !,0ERSI!,
•!PERATI!, SE1UE,I,/
•IMPLEME,T L!/I 2U,TI!, !2 A
TRUT3 TA*LE
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61GC :53C13 G391361GC :53C13 G3913
E
S 2 S 1 S 0
74151
MUX
I0
I1
I2
I 3
I4
I5
I6
I7
ABC C B AC B A Z ++=
+5
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:66 3 ; )6
S 2 S 1 S 0
MUX
I0
I1
I2
I 3
I4
I5
I6
I7
1
0
1
01
0
1
0
A B C
f(ABC)
TEST
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:66 3 ; )6
S 2 S 1 S 0
MUX
I0
I1
I2
I 3
I4
I5
I6
I7
1
0
1
01
0
1
0
A B C
f(ABC)
TEST
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:66 3 ; )6
I0
I 1
P
Q
C
S0
I0
I1
A
S0
Y
I0
I1
I2
I3
L
M
N
O
B C
S1
S0
TEST
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:66 3 ; )6
I0
I 1
P
Q
C
S0
I0
I1
A
S0
Y
I0
I1
I2
I3
L
M
N
O
B C
S1
S0
TEST
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09 )1163 89--13 :19 ;C9C5
I0
I1
I2
I3
1
0
1
1
A B
S1
S0
f(AB)
AB B A B A ++
TEST
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DM56689DM56689
"of% DC1D9"of% DC1D9
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DM56689 61GC DG9MDM56689 61GC DG9M•Lo'i$ $ir$uit that dependin' on the status o% its sele$t inputs +ill %unnel
its data input to one o% seeral data outputs)
•Separate ena&le inputs (use%ul %or $as$adin' de$oders" into A,D 'ate
+hi$h must &e hi'h to ena&le the de$oder outputs)
A2
A1
A0
74138
DEMUX
1-OF-8 DECODER
SELECT LINES
E
1 E
2 E
3 E
0O
1O
2O
3O
4O
5O
6O
7O
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61GC :53C13 G391361GC :53C13 G3913
A2
A1
A0
74138
1 E
2 E
3 E
ABC
+5
0O
1O
2O
3O
4O
5O
6O
7O
f(ABC)
,A,D# an- lo+ in 'ies a hi'h out
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6) <(. -C59= M13193G -=-M6) <(. -C59= M13193G -=-M
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TEST
3M ; C9C53M ; C9C5
A2
A1
A0
1 E
2 E
3 E
0O
1O
2O
3O
4O
5O
6O
7O
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TEST
3M ; C9C53M ; C9C5
ES 2 S 1 S 0
I0
I1
I2
I 3
I4
I5
I6
I7
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TEST
- ; )1163- ; )1163
89--1389--13
E S2
S1
S0
74151
MUX
I0
I1
I2
I3
I4
I5
I6
I7
+5
A B C
C A B B C A CBA + +
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