FSTU3125 查看數據表（PDF） - Fairchild Semiconductor

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FSTU3125

4-Bit Bus Switch with −2V Undershoot Protection

Fairchild Semiconductor 

June 2001

Revised August 2001

FSTU3125

4-Bit Bus Switch with −2V Undershoot Protection

General Description

The Fairchild Switch FSTU3125 provides four high-speed

CMOS TTL-compatible bus switches. The low On Resis-

tance of the switch allows inputs to be connected to out-

puts without adding propagation delay or generating

additional ground bounce noise. The A and B Ports are

protected against undershoot to support an extended

range to 2.0V below ground. Fairchild’s integrated Under-

shoot Hardened Circuit (UHC) senses undershoot at the

I/O and responds by preventing voltage differentials from

developing and turning the switch on.

The device is organized as four 1-bit switches with sepa-

rate 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.

Features

s Undershoot hardened to −2V (A and B Ports)

s 4Ω switch connection between two ports

s Minimal propagation delay through the switch

s Low lCC

s Zero bounce in flow-through mode

s Control inputs compatible with TTL level

s See application notes AN-5008 and AN-5021 for details

on undershoot

Ordering Code:

Order Number Package Number

Package Description

FSTU3125M

M14A

14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

FSTU3125QSC

MQA16

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

FSTU3125MTC

MTC14

14-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.

Connection Diagrams

Pin Descriptions

Pin Assignment for SOIC and TSSOP

Pin Name

OE1, OE2, OE3, OE4

1A, 2A, 3A, 4A

1B, 2B, 3B, 4B

NC

Description

Bus Switch Enables

Bus A

Bus B

Not Connected

Truth Table

Pin Assignment for QSOP

Inputs

OE

L

H

Inputs/Outputs

A,B

A=B

Z

© 2001 Fairchild Semiconductor Corporation DS500449

www.fairchildsemi.com

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