May 2009

© 1997 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FST3257 • Rev. 1.0.3

FST3257

Quad 2:1 Multiplexer / Demultiplexer Bus Switch

Features

4

Ω Switch Connection Between Two Ports

Minimal Propagation Delay Through the Switch

Zero Bounce in Flow-Through Node

Control Inputs Compatible with TTL Level

Description

The Fairchild Switch FST3257 is a quad 2:1 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

propagation delay or generating additional ground

bounce noise.

When /OE is LOW, the select pin connects the A port to

the selected B port output. When /OE is HIGH, the

switch is OPEN and a high-impedance state exists

between the two ports.

Ordering Information

Part Number

Operating

Temperature

Range

Eco Status

Package

Packing

Method

FST3257M

-40 to 85°C

Tubes

FST3257MX

-40 to 85°C

RoHS

16-Lead Small Outline Integrated Circuit

(SOIC) JEDEC MS-012,0.150 Narrow

Tape and Reel

FST3257QSC

-40 to 85°C

Tubes

FST3257QSCX

-40 to 85°C

Green

16-Lead Quarter Size Outline Package

(QSOP) JEDEC MO-137 0.150 Inch Wide

Tape and Reel

FST3257MTC

-40 to 85°C

Tubes

FST3257MTCX

-40 to 85°C

RoHS

16-Lead Thin Shrink Small Outline Package

(TSSOP) JEDEC MO-153, 4mm Wide

Tape and Reel