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74VHCT257A Datasheet(PDF) 2 Page - STMicroelectronics

Part No. 74VHCT257A
Description  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHCT257A Datasheet(HTML) 2 Page - STMicroelectronics

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INPUT EQUIVALENT CIRCUIT
LOGIC DIAGRAM
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCT ION
1
SELECT
Common Data Select Input
2, 5, 14, 11
1A to 4A
Data Inputs from Source A
3, 6, 13, 10
1B to 4B
Data Inputs from Source B
4, 7, 12, 9
1Y to 4Y
3 State Multiplexer Outputs
15
OE
3 State Output Enable
Input (Active LOW)
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
TRUTH TABLE
INPUT S
OUTPUTS
OE
SELE CT
A
B
Y
H
X
XXZ
LL
L
X
L
LL
H
X
H
LH
X
L
L
LH
X
H
H
X = DON’T CARE Z = HIGH IMPEDANCE
Thislogic diagram has notbe used to estimate propagation delays
74VHCT257A
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