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CD74HC137 Datasheet(PDF) 3 Page - Texas Instruments

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Part No. CD74HC137
Description  High Speed CMOS Logic, 3-to-8 Line Decoder Demultiplexer with Address Latches
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD74HC137 Datasheet(HTML) 3 Page - Texas Instruments

 
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Functional Diagram
CD74HC137, CD74HCT137 TRUTH TABLE
INPUTS
OUTPUTS
LE
OE0
OE1
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
H
X
X
X
HHHHHHHH
X
L
X
X
X
X
HHHHHHHH
L
H
LLLLL
H
H
H
H
H
H
H
LHL
L
LH
HLH
H
H
H
H
H
LHL
L
HLH
HLH
H
H
H
H
L
H
L
L
HHHHH
L
HHHH
LHLHL
LH
H
H
HLH
H
H
LHLHLH
H
H
H
H
HLH
H
LHLH
HLH
H
H
H
H
H
LH
LHLH
H
H
H
H
H
H
H
H
HL
H
H
L
X
X
X
Depends upon the address previously applied while LE was at a logic low.
NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care
CD74HC237, CD74HCT237 TRUTH TABLE
INPUTS
OUTPUTS
LE
OE0
OE1
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
H
X
X
X
LLLLLLLL
X
L
X
X
X
X
LLLLLLLL
L
H
LLLL
H
L
LLLLLL
LHL
L
LHLHL
L
L
L
L
L
L
H
LL
H
L
LL
H
L
LLLL
L
H
LL
H
H
LLL
H
LLLL
LHLHL
L
L
L
L
LHL
L
L
LHLHLHL
L
L
L
LHL
L
LHLH
HL
L
L
L
L
L
LHL
L
H
L
H
H
H
LLLLLLL
H
H
H
L
X
X
X
Depends upon the address previously applied while LE was at a logic low.
NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care
15
14
13
12
10
7
9
11
1
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
3
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
237
137
6
2
4
5
A0
A1
A2
LE
OE1
OE0
3-BIT
LATCH
1 OF 8
DECODER
GND = 8
VCC = 16
HC/HCT HC/HCT
CD74HC137, CD74HCT137, CD74HC237, CD74HCT237


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