VSC7122QM 查看數據表（PDF） - Vitesse Semiconductor

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VSC7122QM

Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Quad Port Bypass Circuit for 1.0625 Gbit/sec

Fibre Channel Arbitrated Loop Disk Arrays

Advance Product Information

VSC7122

Package Thermal Characteristics

The VSC7122 is packaged into a standard plastic quad flatpack with an embedded, but unexposed thermal

slug. This package adheres to industry standard EIAJ footprints for a 10x10mm body, 44 lead PQFP. The pack-

age construction is as shown in Figure 6. The 44 PQFP with embedded slug has the thermal properties shown in

Table 5. This package allows the VSC7122 to operate with ambient temperatures up to 70oC in still air.

Figure 6: Package Cross Reference

Wire Bond

Die

Plastic Molding Compound

Insulator

Lead

Table 5: 44 PQFP Thermal Resistance

Symbol

θca-0

θca-100

θca-200

θca-400

θca-600

Description

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

50

43

39

36

34

Units

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.

Page 10

© VITESSE SEMICONDUCTOR CORPORATION

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

G52155-0, Rev. 2.1

8/31/98

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