VSC7128 查看數據表（PDF） - Vitesse Semiconductor

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VSC7128

Hex Port Bypass Circuit / Dual Repeater for 1.0625 Gb/s FC-AL Disk Arrays

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7128

Hex Port Bypass Circuit / Dual Repeater

for 1.0625 Gb/s FC-AL Disk Arrays

Package Thermal Characteristics

The VSC7128 is packaged into a thermally enhanced plastic quad flatpack with an exposed heat spreader.

This package adheres to industry standard EIAJ footprints for a 14x14mm body, 64 lead PQFP. The package

construction and thermal properties are shown below.

The user must ensure that the maximum case temperature specification (90o C) is not violated. Given the

thermal resistance of the package in still air, the user may operate the VSC7128 in still air if the ambient temper-

ature does not exceed 32o C ( 90o C - 1.7W o C * 35 oC/W = 32o C). If operation above this ambient temperature

is required, an appropriate heatsink must be used with the part or adequate airflow must be provided. The ther-

mal resistances given above are for a PCB which is not thermally saturated since significant amounts of heat can

transfer through the leadframe and into the PCB.

Figure 4: Package Cross Reference

Exposed Heat Slug

Insulator

Plastic Molding Compound

Lead

Wire Bond

Die

Table 3: Thermal Resistance

Symbol

θjc

θca-0

θca-100

θca-200

θca-400

θca-600

Description

Thermal resistance from junction to case

Thermal resistance from case to ambient, still air

Thermal resistance from case to ambient, 100 LFPM air

Thermal resistance from case to ambient, 200 LFPM air

Thermal resistance from case to ambient, 400 LFPM air

Thermal resistance from case to ambient, 600 LFPM air

Value

2.5

35

29

26

22

19

Units

oC/W

oC/W

oC/W

oC/W

oC/W

oC/W

Moisture Sensitivity Level

This device is rated with a moisture sensitivity level 3 rating. Refer to Application Note AN-20 for appro-

priate handling procedures.

G52177-0, Rev. 2.3

8/31/98

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

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