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74ACT257 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. 74ACT257
Description  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74ACT257 Datasheet(HTML) 2 Page - STMicroelectronics

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INPUT AND OUTPUT EQUIVALENT CIRCUIT
LOGIC DIAGRAMS
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND F UNCTIO N
1
SELECT
Common Data Select Input
2, 5, 14, 11
1A to 4A
Data Input 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
Inputs (Active LOW)
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
TRUTH TABLE
INPUTS
OUTPUT S
O E
SELECT
ABY
H
X
XXZ
LLL
X
L
LL
H
X
H
LH
X
L
L
LH
X
H
H
X = DON’T CARE Z = HIGH IMPEDANCE
This logic diagram has not be used to estimate propagation delays
74ACT257
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