74LCX138 데이터 시트보기 (PDF) - STMicroelectronics
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74LCX138 Datasheet PDF : 17 Pages
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74LCX138
Pin settings
2.3
Truth table
Note:
Table 2. Truth table
Enable
Inputs
Select
Outputs
G2B G2A G1 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X
X
L
X
X
X
H
H
H
H
H
H
H
H
XHXXXXHHHHHHHH
HXXXXXHHHHHHHH
L
L
H
L
L
L
L
H
H
H
H
H
HH
L
L
H
L
L
HH
L
H
H
H
H
HH
L
L
H
L
H
L
HH
L
H
H
H
HH
L
L
H
L
HHHH
H
L
H
H
HH
L
L
H
H
L
L
HH
H
H
L
H
HH
L
L
H
H
L
HHH
H
H
H
L
HH
L
L
H
H
H
L
HH
H
H
H
H
L
H
L
L
H
H
HHHH
H
H
H
H
H
L
X : Do not care
2.4
Logic diagram
Figure 4. Logic diagram
Note:
This logic diagram has not to be used to estimate propagation delays
5/17
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