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M54HC257K Datasheet(PDF) 2 Page - STMicroelectronics

Part # M54HC257K
Description  RAD-HARD QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M54HC257K Datasheet(HTML) 2 Page - STMicroelectronics

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M54HC257
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IEC LOGIC SYMBOLS
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
Z : High Impedance
PIN N°
SYMBOL
NAME AND FUNCTION
1SELECT
Common Data Select
Input
2, 5, 14, 11
1A to 4A
Data Input From Source A
3, 6, 13, 10
1B to 4B
Data Input From Source B
4, 7, 12, 9
1Y to 4Y
3 State Multiplexer
Outputs
15
OE
3 State Output Enable
Inputs (Active Low)
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
INPUTS
OUTPUT
OE
SELECT
A
B
Y
H
XXX
Z
LLL
X
L
LL
H
X
H
LH
X
L
L
LH
X
H
H


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