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74VHC157MTR Datasheet(PDF) 2 Page - STMicroelectronics

Part No. 74VHC157MTR
Description  QUAD 2 CHANNEL MULTIPLEXER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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 2 page
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74VHC157
2/12
Figure 2: Input Equivalent Circuit
Table 2: Pin Description
Table 3: Truth Table
X : Don’t care
Figure 3: Logic Diagram
PIN N°
SYMBOL
NAME AND FUNCTION
1
SELECT
Common Data Select
Inputs
2, 5, 11, 14
1A to 4A
Data Inputs From Source
A
3, 6, 10, 13
1B to 4B
Data Inputs From Source
B
4, 7, 9, 12
1Y to 4Y
Multiplexer Outputs
15
STROBE
Strobe Input
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
INPUTS
OUTPUT
STROBE
SELECT
A
B
Y
H
XXX
L
LLL
X
L
LL
H
X
H
LH
X
L
L
LH
X
H
H




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