DM74S138 データシートの表示（PDF） - Fairchild Semiconductor
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DM74S138 Datasheet PDF : 5 Pages
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Connection Diagrams
DM74S138
DM74S139
Function Tables
DM74S138
DM74S139
Inputs
Enable Select
Outputs
Inputs
Enable
Select
Outputs
G1 G2* C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
G
B A Y0 Y1 Y2 Y3
X H XXX H H H H H H H H
H
XX
H
H
H
H
L X XXX H H H H H H H H
L
LL
L
H
H
H
H L LLL L H H H H H H H
L
LH
H
L
H
H
H L LLH H L H H H H H H
L
HL
H
H
L
H
H L LHL H H L H H H H H
L
HH
H
H
H
L
H L LHH H H H L H H H H
H L HLL H H H H L H H H
H L HLH H H H H H L H H
H
L HH L H H H H H H L H
* G2 = G2A + G2B
H = HIGH level
H L H H H H H H H H H H L L = LOW level
X = don’t care (either LOW or HIGH logic level)
Logic Diagrams
DM74S138
DM74S139
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