M74HC238 查看數據表（PDF） - STMicroelectronics
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M74HC238 Datasheet PDF : 10 Pages
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M54/M74HC238
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4, 5
6
15, 14, 13,
12, 11, 10, 9,
7
8
16
SYMBOL
A, B, C
G2A G2B
G1
Y0 to Y7
GND
VCC
NAME AND FUNCTION
Data Inputs
Enable Input (Active
LOW)
Data Enable Input
(Active HIGH)
Outputs
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOLS
TRUTH TABLE
INPUTS
ENABLE
SELECT
G2B G2A G1 C
B
A
OUTPUS
SELECTED
OUTPUT
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X
X
L
X
X
X
L
L
L
L
L
L
L
L
NONE
X
H
X
X
X
X
L
L
L
L
L
L
L
L
NONE
HX
X
X
X
X
L
L
L
L
L
L
L
L
NONE
L
L
H
L
L
L
H
L
L
L
L
L
L
L
Y0
L
L
H
L
L
H
L
H
L
L
L
L
L
L
Y1
L
L
H
L
H
L
L
L
H
L
L
L
L
L
Y2
L
L
H
L
H
H
L
L
L
H
L
L
L
L
Y3
L
L
H
H
L
L
L
L
L
L
H
L
L
L
Y4
L
L
H
H
L
H
L
L
L
L
L
H
L
L
Y5
L
L
H
H
H
L
L
L
L
L
L
L
H
L
Y6
L
L
H
H
H
H
L
L
L
L
L
L
L
H
Y7
X: Don’t Care
2/10
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