74ACT257 STMicroelectronics, 74ACT257 Datasheet - Page 2

• Manufacturer Part Number: 74ACT257
• Description: QUAD 2 CHANNEL MULTIPLEXER 3-STATE
• Manufacturer: STMicroelectronics

74ACT257
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INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
X = DON’T CARE Z = HIGH IMPEDANCE
LOGIC DIAGRAMS
This logic diagram has not be used to estimate propagation delays
O E
H
L
L
L
L
SELECT
X
H
H
L
L
INPUT S
A
X
H
X
X
L
PIN DESCRIPTION
2, 5, 14, 11
3, 6, 13, 10
4, 7, 12, 9
PIN No
15
16
1
8
SYMBOL
SELECT
1A to 4A
1B to 4B
1Y to 4Y
GND
V
OE
CC
B
H
X
X
X
L
Common Data Select Input
Data Input From Source A
Data Inputs from Source B
3 State Multiplexer Outputs
3 State Output Enable
Inputs (Active LOW)
Ground (0V)
Positive Supply Voltage
NAME AND F UNCTIO N
OUT PUT S
Y
Z
H
H
L
L