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74FST3244/D Datasheet

  • 74FST3244/D

  • 8-Bit Bus Switch

  • 89.49KB

  • 8頁(yè)

  • ETC

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74FST3244
8-Bit Bus Switch
The ON Semiconductor 74FST3244 is an 8鈥揵it, high performance
switch. The device is CMOS TTL compatible when operating between
4 and 5.5 Volts. The device exhibits extremely low R
ON
and adds
nearly zero propagation delay. The device adds no noise or ground
bounce to the system.
The device consists of two 4鈥揵it switches with separate
Output/Enable (OE) pins. Port A is connected to Port B when OE is
low. If OE is high, the switch is high Z.
http://onsemi.com
MARKING
DIAGRAMS
20
1
SO鈥?0
DW SUFFIX
CASE 751D
1
20
20
FST
3244
ALYW
1
FST3244
AWLYYWW
20
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
R
ON
t
4
W
Typical
Less Than 0.25 ns鈥揗ax Delay Through Switch
Nearly Zero Standby Current
No Circuit Bounce
Control Inputs are TTL/CMOS Compatible
Pin鈥揊or鈥揚(yáng)in Compatible with QS3244, FST3244, CBT3244
All Popular Packages: QSOP鈥?0, TSSOP鈥?0, SOIC鈥?0
1
OE
1
1A
0
2B
3
1A
1
2B
2
1A
2
2B
1
1A
3
2B
0
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
OE
2
1B
0
2A
3
1B
1
2A
2
1B
2
2A
1
1B
3
2A
0
TSSOP鈥?0
DT SUFFIX
CASE 948E
20
1
QSOP鈥?0
QS SUFFIX
CASE 492A
A
L, WL
Y
W, WW
=
=
=
=
20
FST3244
AWLYWW
1
Figure 1. 20鈥揕ead Pinout
Assembly Location
Wafer Lot
Year
Work Week
TRUTH TABLE
Inputs
OE
1
L
L
H
H
OE
2
L
H
L
H
Inputs/Outputs
1A, 1B
1A = 1B
1A = 1B
Z
Z
2A, 2B
2A = 2B
Z
2A = 2B
Z
PIN NAMES
Pin
OE
1
, OE
2
1A, 2A
1B, 2B
Description
Bus Switch Enables
Bus A
Bus B
ORDERING INFORMATION
Device
74FST3244DW
74FST3244DWR2
74FST3244DT
74FST3244DTR2
74FST3244QS
74FST3244QSR
漏
Semiconductor Components Industries, LLC, 2001
Package
SO鈥?0
SO鈥?0
TSSOP鈥?0
TSSOP鈥?0
QSOP鈥?0
QSOP鈥?0
Shipping
38 Units/Rail
1000 Units/Reel
75 Units/Rail
2500 Units/Reel
55 Units/Rail
2500 Units/Reel
1
August, 2001 鈥?Rev. 0
Publication Order Number:
74FST3244/D

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