M74HC253 データシートの表示（PDF） - STMicroelectronics
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M74HC253 Datasheet PDF : 11 Pages
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M74HC253
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 15
14, 2
6, 5, 4, 3
7, 9
10, 11, 12,
13
8
16
SYMBOL NAME AND FUNCTION
1G, 2G
A, B
1C0 to 1C3
1Y, 2Y
2C0 to 2C3
GND
VCC
Output Enable Inputs
Common Data Select
Inputs
Data Inputs From
Source 1
3 State Multiplexer
Outputs
Data Inputs From
Source 2
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
SELECT INPUTS
DATA INPUTS
STROBE
OUTPUT Y
B
A
C0
C1
C2
C3
G
X
X
X
X
X
X
H
Z
L
L
L
X
X
X
L
L
L
L
H
X
X
X
L
H
L
H
X
L
X
X
L
L
L
H
X
H
X
X
L
H
H
L
X
X
L
X
L
L
H
L
X
X
H
X
L
H
H
H
X
X
X
L
L
L
H
H
X
X
X
H
L
H
X : Don’t Care
Z : High Impedance
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