VITESSE

SEMICONDUCTOR CORPORATION

Target Specification

VSC8115

STS-12/STS-3 Multi Rate

Clock and Data Recovery Unit

Page 12

© VITESSE SEMICONDUCTOR CORPORATION

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

9/29/00

G52272-0, Rev. 1.1

Package Thermal Characteristics

The VSC8115 is packaged in a Thin Shrink Small Outline Package (TSSOP). This package conforms to

JEDEC package outline standards. It has hi-conductivity copper lead frames and a very low-stress mold com-

single-layer PCB applications. The air flow versus thermal resistance relationship for multi-layer PCB applica-

tions is shown in Table 11.

Table 11: Theta Case to Ambient versus Air Velocity

Ordering Information

The order number for this product are:

Part Number

Device Type

VSC8115YA:

STS-12/STS-3 Multi-Rate Clock and Data Recovery Unit in a 20 Pin TSSOP

Commercial Temperature, 0

°C ambient to 70°C case

VSC8115YA1

STS-12/STS-3 Multi-Rate Clock and Data Recovery Unit in a 20 Pin TSSOP

Extended Temperature, 0

°C ambient to 110°C case

VSC8115YA2

STS-12/STS-3 Multi-Rate Clock and Data Recovery Unit in a 20 Pin TSSOP

Industrial Temperature, -40

°C ambient to 85°C case

Notice

This document contains information about a proposed product during its design phase of development and

is subject to change without notice at any time. All features and specification are design goals only. Please con-

tact Vitesse Semiconductor to obtain the latest product status and most recent versions of this specification.

Warning

Vitesse Semiconductor Corporation’s product are not intended for use in life support appliances, devices or

systems. Use of a Vitesse product in such applications without the written consent is prohibited.

Air Velocity

(LFPM)

Case to Air

Thermal

Resistance

YA

YA1

YA2

0

55.0

15.4

to

59.6

15.4

to

87.6

-55.4

to

69.6

100

52.0

14.6

to

60.4

14.6

to

88.4

-54.6

to

70.4

200

49.0

13.7

to

61.3

13.7

to

89.3

-53.7

to

71.3

400

46.0

12.9

to

62.1

12.9

to

90.1

-52.9

to

72.1