VSC8221 datasheet(108/138 Pages) MICROSEMI

108 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

108 of 123

123

24.3 Thermal Application Data

VDD12

1.14

1.2

1.26

DC voltage on VDD12 pins

FREFCLK

125

MHz

Local reference clock (REFCLK) nominal

frequency. Refer to FTOL for minimum and

maximum values.

FTOL (REFCLK)

-100

+100

ppm

Reference clock frequency offset tolerance over

specified temperature range

(25 MHz or 125 MHz)

FTOL (LiNK)

-1500

+1500

ppm

CAT5 link partner frequency offset tolerance (for

any link speed)

REXT

2.00

Ω

External reference circuit bias resistor

(1% tolerance).

CREF_FiLT

0.1

µF

External reference generator filter capacitor

(10% tolerance).

TOPER

0100

°C

Operating temperature. Lower limit of

specification is ambient temperature, and upper

limit is case temperature.

Table 36. Thermal Application Data

Printed Circuit Board Conditions (JEDEC JESD51-9)

PCB Layers

PCB Dimensions (mm x mm)

101.6 × 114.3

PCB Thickness (mm)

1.6

Environment Conditions

Maximum operating junction temperature (ºC)

125

Ambient free-air operating temperature (ºC)

Worst Case Power Dissipation (W)

Table 37. Thermal Resistances

Symbol

Typ

Unit

Parameter Description & Conditions

JA (0 m/s airflow)

40.8

°C/W

Junction-to-ambient thermal resistance

JA (1 m/s airflow)

35.5

°C/W

Junction-to-ambient thermal resistance

JA (2 m/s airflow)

34.1

°C/W

Junction-to-ambient thermal resistance

JT (0 m/s airflow)

0.17

°C/W

Junction-to-top center of case thermal resistance

JT (1 m/s airflow)

0.19

°C/W

Junction-to-top center of case thermal resistance

Table 35. Recommended Operating Conditions (continued)

Symbol

Min

Typ

Max

Unit

Parameter Description & Conditions

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