March 2008

©1997 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FST3345 • Rev. 1.0.2

FST3345 — 8-Bit Bus Switch

Features

4

Ω Switch Connection between Two Ports

Minimal Propagation Delay through the Switch

Zero Bounce in Flow-through Mode

Control Inputs Compatible with TTL Level

Description

The FST3345 switch provides eight-bits of high-speed

CMOS TTL-compatible bus switching. 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 an eight-bit switch with dual

output enable inputs (OE and /OE). When /OE is LOW

or OE is HIGH, the switch is ON and port A is

connected to port B. When /OE is HIGH, and OE is

LOW, the switch is OPEN and a high-impedance state

exists between the two ports.

Ordering Information

Part Number

Operating

Temperature

Range

Package

Packing

Method

FST3345WMX

-40 to +85°C

20-Lead, Small Outline Integrated Circuit (SOIC), JEDEC

MS-013, 0.300-inch Wide

Tape and Reel

FST3345QSC

-40 to +85°C

20-Lead Quarter Size Outline Package (QSOP), JEDEC

MO-137, 0.150-inch Wide

Tube

FST3345QSCX

-40 to +85°C

20-Lead Quarter Size Outline Package (QSOP), JEDEC

MO-137, 0.150-inch Wide

Tape and Reel

FST3345MTC

-40 to +85°C

20-Lead Thin Shrink Small Outline Package (TSSOP),

JEDEC MO-153, 4.4mm Wide

Tube

FST3345MTCX

-40 to +85°C

20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC

MO-153, 4.4mm Wide

Tape and Reel

All packages are lead free per JEDEC: J-STD-020B standard.

The Fairchild switch family derives from and embodies Fairchild’s proven switch technology used for several years in its

74LVX3L384 (FST3384) bus switch product.

Logic Diagram

18

11

2

9

1

/OE

OE

19

Figure 1. Logic Diagram