© 2001 Fairchild Semiconductor Corporation

DS500479

www.fairchildsemi.com

February 2001

Revised February 2001

FST3306

2-Bit Low Power Bus Switch

General Description

The FST3306 is a 2-bit ultra high-speed CMOS FET bus

switch with TTL-compatible active LOW control inputs. The

low on resistance of the switch allows inputs to be con-

nected to outputs with minimal propagation delay and with-

out generating additional ground bounce noise. The device

is organized as a 2-bit switch with independent bus enable

(BE) controls. When BE is LOW, the switch is ON and

Port A is connected to Port B. When BE is HIGH, the

switch is OPEN and a high-impedance state exists

between the two ports. Control inputs tolerate voltages up

Features

s Typical 3

Ω switch resistance at 5.0V V

CC

s Minimal propagation delay through the switch

s Power down high impedance input/output

s Zero bounce in flow through mode.

s TTL compatible active LOW control inputs

s Control inputs are overvoltage tolerant

Ordering Code:

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

Logic Symbol

Connection Diagram

(Top View)

Pin Descriptions

Function Table

H

= HIGH Logic Level

L

= LOW Logic Level

Order Number

Package Number

Package Description

FST3306MTC

MTC08

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

Pin Name

Description

ABus A

BBus B

BE

Bus Enable Input

Bus Enable Input BE

Function

L

B Connected to A

H

Disconnected