VITESSE
SEMICONDUCTOR CORPORATION
Target Specification
STS-12/STS-3 Multi Rate
Clock and Data Recovery Unit
VSC8115
Package Thermal Characteris tics
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-
o
o
pound. The junction to case thermal resistance is 80 C/W for multi-layer PCB applications and 126 C/W for
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
Ta (Ambient Temperature) Range (oC)
Case to Air
Air Velocity
(LFPM)
Thermal
Resistance
(oC/W)
YA
YA1
YA2
(0oC to 75oC ) Tcase
(0oC to 103oC ) Tcase
(-40oC to 85oC ) Tcase
0
55.0
52.0
49.0
46.0
15.4
14.6
13.7
12.9
to
to
to
to
59.6
60.4
61.3
62.1
15.4
14.6
13.7
12.9
to
to
to
to
87.6
88.4
89.3
90.1
-55.4
-54.6
-53.7
-52.9
to
to
to
to
69.6
70.4
71.3
72.1
100
200
400
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
VSC8115YA2
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
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.
G52272-0, Rev. 1.1
Page 12
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741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
9/29/00
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