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74FST3244 Datasheet, PDF (1/8 Pages) ON Semiconductor – 8-Bit Bus Switch | |||
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74FST3244
8âBit Bus Switch
The ON Semiconductor 74FST3244 is an 8âbit, high performance
switch. The device is CMOS TTL compatible when operating between
4 and 5.5 Volts. The device exhibits extremely low RON and adds
nearly zero propagation delay. The device adds no noise or ground
bounce to the system.
The device consists of two 4âbit 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.
Features
⢠RON t 4 W Typical
⢠Less Than 0.25 nsâMax Delay Through Switch
⢠Nearly Zero Standby Current
⢠No Circuit Bounce
⢠Control Inputs are TTL/CMOS Compatible
⢠PinâForâPin Compatible with QS3244, FST3244, CBT3244
⢠All Popular Packages: QSOPâ20, TSSOPâ20, SOICâ20
⢠All Devices in Package TSSOP are Inherently PbâFree*
OE1 1
1A0 2
2B3 3
1A1 4
2B2 5
1A2 6
2B1 7
1A3 8
2B0 9
GND 10
20 VCC
19 OE2
18 1B0
17 2A3
16 1B1
15 2A2
14 1B2
13 2A1
12 1B3
11 2A0
Figure 1. 20âLead Pinout
TRUTH TABLE
Inputs
OE1 OE2
L
L
L
H
H
L
H
H
Inputs/Outputs
1A, 1B
2A, 2B
1A = 1B
1A = 1B
Z
Z
2A = 2B
Z
2A = 2B
Z
http://onsemi.com
20
1
SOICâ20
DW SUFFIX
CASE 751D
MARKING
DIAGRAMS
20
FST3244
AWLYYWW
1
20
1
TSSOPâ20
DT SUFFIX
CASE 948E
20
FST
3244
ALYW
1
20
1
QSOPâ20
QS SUFFIX
CASE 492A
20
FST3244
AWLYWW
1
A
= Assembly Location
L, WL = Wafer Lot
Y
= Year
W, WW = Work Week
PIN NAMES
Pin
OE1, OE2
1A, 2A
1B, 2B
Description
Bus Switch Enables
Bus A
Bus B
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
*For additional information on our PbâFree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
1
January, 2005 â Rev. 1
Publication Order Number:
74FST3244/D
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