FST34170 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 B
1
or B
2
or
both.
Two select (SEL
1
, SEL
2
) inputs provide switch enable con-
trol.
Features
s
Slower Output Enable times prevent signal disruption
s
4
鈩?/div>
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
FST34170MTD
Package Number
MTD56
Package Description
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 鈥淴鈥?to the ordering code.
Logic Diagram
Connection Diagram
Truth Table
Inputs
SEL
1
L
H
L
H
SEL
2
H
L
L
H
Function
x A
=
x B
1
x A
=
x B
2
x A
=
x B
1
and x B
2
Switch Open
Pin Descriptions
Pin Name
SEL
1
, SEL
2
A
B
1
, B
2
Description
Select Inputs
Bus A
Bus B
UHC錚?is a trademark of Fairchild Semiconductor Corporation.
漏 2000 Fairchild Semiconductor Corporation
DS500450
www.fairchildsemi.com
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