M74HC251 데이터 시트보기 (PDF) - STMicroelectronics
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M74HC251 Datasheet PDF : 11 Pages
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M74HC251
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
C
X
L
L
L
L
H
H
H
H
X : Don’t Care
Z : High Impedance
INPUTS
B
A
X
X
L
L
L
H
H
L
H
H
L
L
L
H
H
L
H
H
PIN DESCRIPTION
PIN No
4, 3, 2, 1, 15,
14, 13, 12
5
6
7
11, 10, 9
8
16
SYMBOL
D0 to D7
Y
W
STROBE
A, B, C
GND
Vcc
NAME AND FUNCTION
Multiplexer Inputs
Multiplexer Output
Complementary Multi-
plexer Output
3 State Output Enable
Input
Select Inputs
Ground (0V)
Positive Supply Voltage
STROBE
S
H
L
L
L
L
L
L
L
L
OUTPUTS
Y
W
Z
Z
D0
D0
D1
D1
D2
D2
D3
D3
D4
D4
D5
D5
D6
D6
D7
D7
2/11
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