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DM74LS155 Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. DM74LS155
Description  Dual 2-Line to 4-Line Decoders/Demultiplexers
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74LS155 Datasheet(HTML) 2 Page - Fairchild Semiconductor

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2
Function Tables
3-Line-to-8-Line Decoder or 1-Line-to-8-Line Demultiplexer
2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer
H
= HIGH level
L
= LOW level
X
= don’t care
Note 1: C
= inputs C1 and C2 connected together
Note 2: G
= inputs G1 and G2 connected together
Logic Diagram
Inputs
Outputs
Select
Strobe
(0)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Or Data
C (Note 1)
B
A
G (Note 2)
2Y0
2Y1
2Y2
2Y3
1Y0
1Y1
1Y2
1Y3
X
X
X
H
HHHHHHHH
L
L
L
L
L
HHHHHHH
L
L
H
L
H
L
HHHHHH
L
H
L
L
HH
L
HHHHH
L
H
H
L
HHH
L
HHHH
H
L
L
L
HHHH
L
HHH
H
L
H
L
HHHHH
L
H
H
H
H
L
L
HHHHHH
L
H
H
H
H
L
HHHHHHH
L
Inputs
Outputs
Select
Strobe
Data
1Y0
1Y1
1Y2
1Y3
BA
G1
C1
X
X
H
X
H
HHH
L
L
L
H
L
HHH
LH
L
H
H
L
H
H
HL
L
H
H
H
L
H
HH
L
H
H
H
H
L
X
X
X
L
H
HHH
Inputs
Outputs
Select
Strobe
Data
2Y02Y1
2Y22Y3
BA
G2
C2
X
X
H
X
HH
HH
LL
L
L
L
H
H
H
LH
L
L
H
L
H
H
HL
L
L
H
H
L
H
HH
L
L
H
H
H
L
X
X
X
H
HH
HH


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