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PDF FST3244QSC Data sheet ( Hoja de datos )

Número de pieza FST3244QSC
Descripción Octal Bus Switch
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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June 1997
Revised December 1999
FST3244
Octal Bus Switch
General Description
The Fairchild Switch FST3244 provides 8-bits of high-
speed CMOS TTL-compatible bus switching in a standard
’244 pin-out. The low on resistance of the switch allows
inputs to be connected to outputs without adding propaga-
tion delay or generating additional ground bounce noise.
The device is organized as two 4-bit switches with separate
OE inputs. When OE is LOW, the switch is ON and Port A
is connected to Port B. When OE is HIGH, the switch is
OPEN and a high-impedance state exists between the two
ports.
Features
s 4switch connection between two ports.
s Minimal propagation delay through the switch.
s Low lCC.
s Zero bounce in flow-through mode.
s Control inputs compatible with TTL level.
Ordering Code:
Order Number
FST3244WM
FST3244QSC
Package Number
Package Description
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
MQA20
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
FST3244MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Connection Diagram
Pin Descriptions
Pin Name
OE1, OE2
1A, 2A
1B, 2B
Description
Bus Switch Enable
Bus A
Bus B
Truth Table
Inputs
OE1
L
OE2
L
LH
HL
HH
Inputs/Outputs
1A, 1B
1A = 1B
1A = 1B
Z
Z
2A, 2B
2A = 2B
Z
2A = 2B
Z
© 1999 Fairchild Semiconductor Corporation DS500021
www.fairchildsemi.com

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FST3244QSC pdf
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC20
Technology Description
The Fairchild Switch family derives from and embodies Fairchild’s proven switch technology used for several years in its
74LVX3L384 (FST3384) bus switch product.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
5 www.fairchildsemi.com

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