VSC8110GB 데이터 시트보기 (PDF) - Vitesse Semiconductor

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VSC8110GB

ATM/SONET/SDH 155/622 Mb/s Transceiver Mux/Demux with Integrated Clock Generation

Vitesse Semiconductor 

VITESSE

VSC8110

Data Sheet

ATM/SONET/SDH 155/622 Mb/s Transceiver

Mux/Demux with Integrated Clock Generation

Signal

STS12

PLLM

VTTL

EQULOOP

Pin

I/O

Level

Pin Description

97

I

TTL

155Mb/s or 622Mb/s mode select, refer to table 13

98

O

VECL PLL test output, leave unconnected in system operation

99

+5.0V +5 volt supply

100

I

TTL

Equipment loopback, active high

The VSC8110 is manufactured in a 100PQFP package which is supplied by two different vendors. The crit-

ical dimensions in the drawing represent the superset of dimensions for both packages. The significant differ-

ence between the two packages is in the shape and size of the heatspreader which needs to be considered when

attaching a heatsink.

Package Thermal Characteristics

The VSC8110 is packaged in a thermally enhanced 100PQFP with an embedded heat sink. The heat sink

surface configurations are shown in the package drawings. With natural convection, the case to air thermal resis-

tance is estimated to be 27.5oC/W. The air flow versus thermal resistance relationship is shown in table 16.

Table 16: Theta Case to Ambient versus Air Velocity

Air Velocity

(LFPM)

0

100

200

400

600

Case to air thermal resistance

oC/W

27.5

23.1

19.8

17.6

16

G51011-0, Rev. 1.5

® VITESSE Semiconductor Corporation

Page 15

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