SN74LS147 SN74LS148
SN74LS147
FUNCTION TABLE
INPUTS
1
H
X
X
X
X
X
X
X
X
L
2
H
X
X
X
X
X
X
X
L
H
3
H
X
X
X
X
X
X
L
H
H
4
H
X
X
X
X
X
L
H
H
H
5
H
X
X
X
X
L
H
H
H
H
6
H
X
X
X
L
H
H
H
H
H
7
H
X
X
L
H
H
H
H
H
H
8
H
X
L
H
H
H
H
H
H
H
9
H
L
H
H
H
H
H
H
H
H
D
H
L
L
H
H
H
H
H
H
H
OUTPUTS
C
H
H
H
L
L
L
L
H
H
H
B
H
H
H
L
L
H
H
L
L
H
A
H
L
H
L
H
L
H
L
H
L
EI
H
L
L
L
L
L
L
L
L
L
0
X
H
X
X
X
X
X
X
X
L
1
X
H
X
X
X
X
X
X
L
H
2
X
H
X
X
X
X
X
L
H
H
3
X
H
X
X
X
X
L
H
H
H
SN74LS148
FUNCTION TABLE
INPUTS
4
X
H
X
X
X
L
H
H
H
H
5
X
H
X
X
L
H
H
H
H
H
6
X
H
X
L
H
H
H
H
H
H
7
X
H
L
H
H
H
H
H
H
H
A2
H
H
L
L
L
L
H
H
H
H
OUTPUTS
A1
H
H
L
L
H
H
L
L
H
H
A0
H
H
L
H
L
H
L
H
L
H
GS
H
H
L
L
L
L
L
L
L
L
EO
H
L
H
H
H
H
H
H
H
H
H = HIGH Logic Level, L = LOW Logic Level, X = Irrelevant
FUNCTIONAL BLOCK DIAGRAMS
1
(11)
0
(12)
(9)
(13)
2
(1)
3
(2)
(7)
B
4
(3)
5
(4)
(6)
A
1
(10)
(15)
(11)
(14)
EO
GS
2
3
(12)
(8)
(13)
(1)
(7)
A0
4
5
6
7
(2)
A1
(3)
C
6
(4)
7
(6)
8
9
(5)
(10)
(14)
A2
D
(5)
EI
SN74LS147
SN74LS148
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