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FSTU3384

10-Bit Bus Switch with −2V Undershoot Protection

Fairchild Semiconductor 

May 1999

Revised October 2006

FSTU3384

10-Bit Bus Switch with −2V Undershoot Protection

General Description

The Fairchild Switch FSTU3384 provides 10 bits of high-

speed CMOS TTL-compatible bus switches. The low on

resistance of the switch allows inputs to be connected to

outputs without adding propagation delay generating addi-

tional ground bounce noise. Both the A Ports and the B

Ports have “undershoot hardened” circuit protection to sup-

port an extended input range to 2.0V below ground. Fair-

child’s integrated Undershoot Hardened Circuit (UHC®)

senses undershoot at the I/Os, and responds by preventing

voltage differentials from developing and turning on the

switch. The device is organized as two 5-bit switches with

separate bus enable (OE) signals. 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.

Features

s 4Ω switch connection between two ports

s Undershoot Hardened to -2.0V.

s Minimal propagation delay through the switch

s Low lCC.

s Zero ground bounce in flow-through mode

s Control inputs compatible with TTL level

s See Applications Note AN-5008 for details.

Ordering Code:

Order Number Package Number

Package Description

FSTU3384WM

M24B

24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

FSTU3384QSC

MQA24

24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide

FSTU3384MTC

MTC24

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

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

Logic Diagram

Connection Diagram

Pin Descriptions

Pin Names

OE1, OE2

A0–A9

B0–B9

Description

Bus Switch Enable

Bus A

Bus B

Truth Table

OE1 OE2

B0–B4

B5–B9

Function

L

L A0–A4

L

H A0–A4

A5–A9

HIGH-Z State

Connect

Connect

H L HIGH-Z State A5–A9

Connect

H H HIGH-Z State HIGH-Z State Disconnect

UHC® is a registered trademark of Fairchild Semiconductor Corporation.

© 2000 Fairchild Semiconductor Corporation DS500195

www.fairchildsemi.com

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