© 2000 Fairchild Semiconductor Corporation

DS500450

www.fairchildsemi.com

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

both.

trol.

Features

s Slower Output Enable times prevent signal disruption

s 4

Ω switch connection between two ports.

s Minimal propagation delay through the switch.

s Zero bounce in flow-through mode.

s Control inputs compatible with TTL level.

s See Applications Note AN-5008 for details

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Diagram

Truth Table

Connection Diagram

Pin Descriptions

UHC

 is a trademark of Fairchild Semiconductor Corporation.

Order Number

Package Number

Package Description

FST34170MTD

MTD56

56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Inputs

Function

LH

x A

= x B

1

HL

x A

= x B

2

LL

x A

= x B

H

H

Switch Open

Pin Name

Description

Select Inputs

ABus A

Bus B