74VHCT257A 查看數據表（PDF） - STMicroelectronics
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74VHCT257A Datasheet PDF : 10 Pages
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74VHCT257A
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 5, 14, 11
3, 6, 13, 10
4, 7, 12, 9
15
8
16
S YM BO L
SELECT
1A to 4A
1B to 4B
1Y to 4Y
OE
GND
VCC
NAME AND FUNCTION
Common Data Select Input
Data Inputs from Source A
Data Inputs from Source B
3 State Multiplexer Outputs
3 State Output Enable
Input (Active LOW)
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUT S
OE
SELE CT
A
H
X
X
L
L
L
L
L
H
L
H
X
L
H
X
X = DON’T CARE Z = HIGH IMPEDANCE
LOGIC DIAGRAM
OU T PU T S
B
Y
X
Z
X
L
X
H
L
L
H
H
Thislogic diagram has notbe used to estimate propagation delays
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