M74HCT137 查看數據表（PDF） - STMicroelectronics
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M74HCT137 Datasheet PDF : 11 Pages
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M74HCT137
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4
5
6
9, 10, 11, 12,
13, 14, 15,
7
8
16
SYMBOL
A to C
GL
G2
G1
Y0 to Y7
NAME AND FUNCTION
Data Inputs
Latch Enable Input (Active
LOW)
Data Enable Input(Active
LOW)
Data Enable Input (Active
HIGH)
Multiplexer Outputs
GND
VCC
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
ENABLE
SELECT
GL G1 G2
C
B
A
X
X
H
X
X
X
X
L
X
X
X
X
L
H
L
L
L
L
L
H
L
L
L
H
L
H
L
L
H
L
L
H
L
L
H
H
L
H
L
H
L
L
L
H
L
H
L
H
L
H
L
H
H
L
L
H
L
H
H
H
H
H
L
X
X
X
OUTPUTS
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
Outputs corresponding to stored address L: all others H
2/11
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