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TS-440
S
SEMICONDUCTO
R
SN74LS138H (Control unit
IC51)
Dat
a
output
s
TRUTH TABL
E
Input
Outpu
t
Enable
Selec
t
G,
G
2
C
B
A
Yo Y,
Y
2
Y
3
Y,
Y
5
Y
6
Y
7
x
H
x x
x
H H H
H
H H H H
L
x x x
x
H H H
H H
H H H
H
L
L L
L
L
H H
H
H H H H
H
L
L
L
H H
L
H
H
H H H H
H
L
L
H
L
H
H
L
H
H H H
H
H
L
L
H
H H
H
H
L
H H H
H
H
L
H
L
L
H
H
H
H
L
H H
H
H
L
H
L
H H
H
H H H
L
H
H
H
L
H H
L
H
H
H H H
H
L
H
H
L
H H H H
H
H H H
H
H
L
Note
: 1
. G
2
=G
2
A+G
2
B
2
. H
: High leve
l
L
: Low leve
l
X
:
"H"
or
"L"
2
7