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Advanced 10/100 Unmanaged Repeater — LXT9883/9863

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

4.2.6

MII Terminations

The LXT98x3 MIIs have high output impedance (250-350

Ω). To minimize reflections, serial

termination resistors are recommended on all MII signals, especially with designs with long traces

(>3 inches). Place the resistor as close to the device as possible. Use a software trace termination

package to select an optimal resistance value for the specific trace. Proper value = nominal trace

impedance minus 13

Ω. If a software package cannot be used and nominal trace impedance is not

known, use 55

Ω.

Figure 10. Power and Ground Connections

RBIAS

VCC

GND

VCC

GND

.01

µF

22.1k

Ω 1%

GND

VCC

0.1

µF

Ferrite

Beads

µF

+3.3V

LXT9883

VCCT

GND

µF

.01

µF

Digital Supply Plane

Analog Supply Plane

.01

µF

To Output Magnetics Centertap

9883 Datasheet(PDF) 35 Page - Intel Corporation

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