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Fairchild Semiconductor - Octal Bus Switch

Numéro de référence FST3244QSC
Description Octal Bus Switch
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FST3244QSC fiche technique
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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