VSC7130 データシートの表示（PDF） - Vitesse Semiconductor
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VSC7130 Datasheet PDF : 22 Pages
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Data Sheet
VSC7130
VITESSE
SEMICONDUCTOR CORPORATION
Dual Repeater/Retimer
for Fibre Channel and Gigabit Ethernet
Package Thermal Characteristics
The VSC7130 is packaged in an exposed pad, thin quad flatpack (TQFP) which adheres to industry-stan-
dard EIAJ footprints for a 10x10x1.0mm body, 64-lead TQFP. The package construction is shown in Figure 13.
The bottom of the leadframe is exposed so that it can be soldered to the printed circuit board and connected to
the ground plane. This provides excellent thermal characteristics and reduces electrical parasitics as well. Note:
contact Vitesse for the package vendor Application Note for details about using the exposed pad.
Figure 13: Package Cross Section
Wire Bond
Die
Plastic Molding Compound
Die Attach Epoxy
Copper Lead Frame
Grounded Down Bond
Exposed Pad
Table 7: 64-pin, Exposed Pad, TQFP Thermal Resistance
Symbol
qCA-0
qCA-100
qCA-200
qCA-400
qCA-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
30
25
23
21
20
Units
oC/W
oC/W
oC/W
oC/W
oC/W
The VSC7130 is designed to operate with a case temperature up to 95oC. The user must guarantee that the
case temperature specification is not violated. With the thermal resistances shown above, the VS7130 can oper-
ate in still air ambient temperatures of 70oC [ ~70oC = 95oC - 0.8W * 30 ]. If the ambient air temperature
exceeds these limits then some form of cooling through a heatsink or an increase in airflow must be provided.
Additional heat can be transferred to the printed circuit board by not using thermal reliefs on the power and
ground plane vias as well as using multiple vias to the power and ground planes.
If the exposed pad is not soldered to the printed circuit board and grounded, both thermal and electrical per-
formance will be degraded significantly.
Moisture Sensitivity Level
This device is rated at a Moisture Sensitivity Level 3 rating with maximum floor life of 168 hours at 30ºC,
60% relative humidity. Please refer to Application Note AN-20 for appropriate handling procedures
G52297-0, Rev 4.0
04/02/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
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