March 2008

© 1997 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FST3244 • Rev. 1.0.3

FST3244 — 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 FST3244 switch provides eight-bits of high-speed,

CMOS, TTL-compatible bus switching in a standard

’244 pin-out. The low on resistance allows inputs to be

connected to outputs without adding propagation delay

or generating additional ground bounce noise.

The device is organized as two four-bit switches with

separate /OE inputs. 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-impedance state

exists between the two ports.

Ordering Information

Part Number

Operating

Temperature

Range

Package

Packing

Method

FST3244WMX

-40 to +85°C

20-Lead, Small Outline Integrated Circuit (SOIC), JEDEC MS-013,

0.300-inch Wide

Tape and

Reel

FST3244QSCX

-40 to +85°C

20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137,

0.150-inch Wide

Tape and

Reel

FST3244MTCX

-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

12

1

2

8

11

17

9

3

19

Figure 1. Logic Diagram