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74HC137 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. 74HC137
Description  3-to-8 line decoder, demultiplexer with address latches inverting
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 5 page
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9397 750 13804
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 03 — 11 November 2004
5 of 19
Philips Semiconductors
74HC137
3-to-8 line decoder, demultiplexer with address latches; inverting
6.2 Pin description
7.
Functional description
7.1 Function table
[1]
H = HIGH voltage level;
L = LOW voltage level;
X = don’t care.
Table 3:
Pin description
Symbol
Pin
Description
A0
1
data input 0
A1
2
data input 1
A2
3
data input 2
LE
4
latch enable input (active LOW)
E1
5
data enable input 1 (active LOW)
E2
6
data enable input 2 (active HIGH)
Y7
7
multiplexer output 7
GND
8
ground (0 V)
Y6
9
multiplexer output 6
Y5
10
multiplexer output 5
Y4
11
multiplexer output 4
Y3
12
multiplexer output 3
Y2
13
multiplexer output 2
Y1
14
multiplexer output 1
Y0
15
multiplexer output 0
VCC
16
positive supply voltage
Table 4:
Function table [1]
Enable
Input
Output
LE
E1
E2
A0
A1
A2
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
H
L
H
X
X
X
stable
X
H
X
X
X
X
HHHHHHHH
X
X
L
X
X
X
HHHHHHHH
L
L
H
L
L
L
L
HHHHHHH
H
L
L
H
L
HHHHHH
L
H
L
HHL
HHHHH
H
H
L
HHHL
HHHH
L
L
H
HHHHL
HHH
H
L
H
HHHHHL
HH
L
H
H
HHHHHHL
H
H
H
H
HHHHHHHL




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