December 1993

Revised May 1999

© 1999 Fairchild Semiconductor Corporation

DS011652.prf

www.fairchildsemi.com

FST3383

10-Bit Low Power Bus-Exchange Switch

General Description

The FST3383 provides two sets of high-speed CMOS TTL-

compatible bus switches. The low on resistance of the

switch allows inputs to be connected to outputs without

adding propagation delay or generating additional ground

bounce noise. The device operates as a 10-bit bus switch

or a 5-bit bus exchanger. The bus exchange (BX) signal

provides nibble swapping of the AB and CD pairs of sig-

nals. This exchange configuration allows byte swapping of

buses in systems. It can also be used as a quad 2-to-1

multiplexer and to create low delay barrel shifters. The bus

enable (BE) signal turns the switches ON.

Features

s 5

Ω switch connection between two ports

s Zero propagation delay

s Ultra low power with 0.2

µA typical I

CC

s Zero ground bounce in flow-through mode

s Control inputs compatible with TTL level

Ordering Code:

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

Logic Diagram

Pin Descriptions

Connection Diagram

Truth Table

Order Number

Package Number

Package Description

FST3383WM

M24B

24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

FST3383QSC

MQA24

24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide

FST3383MTC

MTC24

24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names

Description

BE

Bus Switch Enable

BX

Bus Exchange

Buses A, B

Buses C, D

BE BX

Function

H

X

High-Z State High-Z State Disconnect

LL

Connect

LH

Exchange