Multiplexer

7/17/2019 Multiplexer

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Digital ElectronicsDigital Electronics

Electronics TechnologyElectronics Technology

Landon Johnson

Multiplexers

Demultiplexers



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.



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



)-C 0135 M56689)-C 0135 M56689

DATA

INPUT S

I1

I0

S

SELECT INPUT

S I S I Z ⋅+⋅=10



:15935 M56689:15935 M56689

S0S1

I0

I1

I2

I3



%to" 3C1D9%to" 3C1D9



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



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



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



: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



: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



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



DM56689DM56689

"of% DC1D9"of% DC1D9



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



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



6) <(. -C59= M13193G -=-M6) <(. -C59= M13193G -=-M



TEST

3M ; C9C53M ; C9C5

A2

A1

A0

1 E

2 E

3 E

0O

1O

2O

3O

4O

5O

6O

7O



TEST

3M ; C9C53M ; C9C5

ES 2 S 1 S 0

I0

I1

I2

I 3

I4

I5

I6

I7



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 + +



TEST

- ; )1163- ; )1163

89--1389--13

A2

A1

A0

74138

1 E

2 E

3 E

CBA

+5

0O

1O

2O

3O

4O

5O

6O

7O

f(ABC)

A B C B C A CBA + +

Multiplexer

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