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ON Semiconductor - 8-Bit Bus Switch

Numéro de référence 74FST3244
Description 8-Bit Bus Switch
Fabricant ON Semiconductor 
Logo ON Semiconductor 





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74FST3244 fiche technique
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74FST3244
8−Bit Bus Switch
The ON Semiconductor 74FST3244 is an 8bit, 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 4bit 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 nsMax Delay Through Switch
Nearly Zero Standby Current
No Circuit Bounce
Control Inputs are TTL/CMOS Compatible
PinForPin Compatible with QS3244, FST3244, CBT3244
All Popular Packages: QSOP20, TSSOP20, SOIC20
All Devices in Package TSSOP are Inherently PbFree*
OE1
1A0
2B3
1A1
2B2
1A2
2B1
1A3
2B0
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 OE2
18 1B0
17 2A3
16 1B1
15 2A2
14 1B2
13 2A1
12 1B3
11 2A0
Figure 1. 20Lead Pinout
TRUTH TABLE
Inputs
OE1
OE2
LL
LH
HL
HH
Inputs/Outputs
1A, 1B
2A, 2B
1A = 1B
1A = 1B
Z
Z
2A = 2B
Z
2A = 2B
Z
http://onsemi.com
20
1
SOIC20
DW SUFFIX
CASE 751D
MARKING
DIAGRAMS
20
FST3244
AWLYYWW
1
20
1
TSSOP20
DT SUFFIX
CASE 948E
20
FST
3244
ALYW
1
20
1
QSOP20
QS SUFFIX
CASE 492A
20
FST3244
AWLYWW
1
A
L, WL
Y
W, WW
=
=
=
=
PIN NAMES
Pin
OE1, OE2
1A, 2A
1B, 2B
Assembly Location
Wafer Lot
Year
Work Week
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 PbFree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
June, 2006 Rev. 2
1
Publication Order Number:
74FST3244/D

PagesPages 7
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