FST34170 Datasheet, PDF (1/4 Pages) Fairchild Semiconductor – 17-Bit to 34-Bit Multiplexer/Demultiplexer Bus Switch

October 2000
Revised December 2000
FST34170
17-Bit to 34-Bit Multiplexer/Demultiplexer Bus Switch
General Description
The Fairchild Switch FST34170 is a 17-bit to 34-bit high-
speed CMOS TTL-compatible multiplexer/demultiplexer
bus switch. 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 can be used in applications where two buses
need to be addressed simultaneously. The FST34170 is
designed so that the A Port demultiplexes into B₁ or B₂ or
both.
Two select (SEL₁, SEL₂) inputs provide switch enable con-
trol.
Features
s Slower Output Enable times prevent signal disruption
s 4Ω switch connection between two ports.
s Minimal propagation delay through the switch.
s Low l_CC.
s Zero bounce in flow-through mode.
s Control inputs compatible with TTL level.
s See Applications Note AN-5008 for details
Ordering Code:
Order Number Package Number
Package Description
FST34170MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Connection Diagram
Truth Table
Inputs
SEL₁
SEL₂
L
H
H
L
L
L
H
H
Function
x A = x B₁
x A = x B₂
x A = x B₁ and x B₂
Switch Open
Pin Descriptions
Pin Name
SEL₁, SEL₂
A
B₁, B₂
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation DS500450
Description
Select Inputs
Bus A
Bus B
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