SN74LS147 SN74LS148

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3

SN74LS147

FUNCTION TABLE

INPUTS

OUTPUTS

1

2

3

4

5

6

7

8

9

D

C

B

A

H

H

H

H

H

H

H

H

H

H

H

H

H

X

X

X

XX

XX

X

L

L

HH

L

X

X

X

XX

XX

L

H

L

HH

H

X

XX

X

X

X

L

H

H

H

LL

L

X

XX

X

X

L

H

H

H

H

LL

H

X

X

X

X

L

HH

HH

H

LH

L

X

X

X

L

H

HH

HH

H

LH

H

X

X

L

HH

HH

HH

H

HL

L

X

L

H

HH

HH

HH

H

HL

H

L

H

H

H

H

H

H

H

H

H

H

H

L

SN74LS148

FUNCTION TABLE

INPUTS

OUTPUTS

EI

0

1

2

3

4

5

6

7

A2

A1

A0

GS

EO

H

X

X

X

X

X

X

X

X

H

H

H

H

H

L

HHH

HHH

HH

H

HH

H

L

L

XXX

XXX

X

L

L

LL

L

H

L

XXX

XXX

L

H

L

LH

L

H

L

XXX

XX

L

H

H

L

HL

L

H

L

XXX

X

L

H

H

H

L

HH

L

H

L

XXX

L

H

H

H

H

H

LL

L

H

L

X

X

L

HHH

HH

H

LH

L

H

L

X

L

H

HHH

HH

H

HL

L

H

L

L

H

H

H

H

H

H

H

H

H

H

L

H

H = HIGH Logic Level, L = LOW Logic Level, X = Irrelevant

FUNCTIONAL BLOCK DIAGRAMS

SN74LS147

SN74LS148

1

2

3

4

5

6

7

8

9

(11)

(12)

(13)

(1)

(2)

(3)

(4)

(5)

(10)

(9)

(7)

(6)

(14)

A

B

C

D

0

1

2

3

4

5

6

7

EI

(10)

(11)

(12)

(13)

(1)

(2)

(3)

(4)

(5)

(15)

EO

(14)

GS

(8)

A0

(7)

A1

(6)

A2