M74HC42TTR 查看數據表（PDF） - STMicroelectronics
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M74HC42TTR Datasheet PDF : 9 Pages
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M74HC42
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
15, 14, 13,
12
1, 2, 3, 4, 5,
6, 7, 8, 9, 10,
11
8
16
SYMBOL
A, B, C, D
Y0 TO Y9
GND
Vcc
NAME AND FUNCTION
Data Inputs
Multiplexer Outputs
Ground (0V)
Positive Supply Voltage
FUNCTIONAL TABLE
CODE No
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
BCD INPUTS
D
C
B
A
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
H
L
L
L
H
L
L
H
H
L
H
L
H
L
H
H
H
H
L
L
H
H
L
H
H
H
H
L
H
H
H
H
Y0
Y1
L
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
DECIMAL OUTPUTS
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
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
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
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