© 2002 Fairchild Semiconductor Corporation

DS500620

www.fairchildsemi.com

June 2002

Revised October 2002

FST32X245

16-Bit Bus Switch

General Description

The Fairchild Switch FST32X245 provides 16-bits of high

speed CMOS TTL-compatible bus switching in a standard

flow-through mode. 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 is organized as a 16-bit switch. 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-imped-

ance state exists between the two ports.

Features

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 16-bit version of FST3245

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

Function Table

Order Number

Package

Number

Package Description

FST32X245QSP

MQA40A

40-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide

Pin Name

Description

Bus Switch Enable

Bus A

Bus B

NC

No Connect

Function

L

Connect

H

Disconnect