M74HC238B1R データシートの表示（PDF） - STMicroelectronics
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M74HC238B1R Datasheet PDF : 10 Pages
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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
NAME AND FUNCTION
Data Inputs
Enable Input (Active
LOW)
Data Enable Input (Active
HIGH)
Outputs
GND
VCC
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
ENABLE
SELECT
G2B G2A G1 C B A
X
X
L
X
X
X
X
H
X
X
X
X
H
X
X
X
X
X
L
L
H
L
L
L
L
L
H
L
L
H
L
L
H
L
H
L
L
L
H
L
HH
L
L
H
H
L
L
L
L
H
H
L
H
L
L
H
H
H
L
L
L
H
H
HH
X : Don’t Care
LOGIC DIAGRAM
OUTPUTS
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
SELECTED
OUTPUT
NONE
NONE
NONE
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
This logic diagram has not be used to estimate propagation delays
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