RTL8111C-VB-GR View Datasheet(PDF) - Realtek Semiconductor

Part Name

Description

MFG CO.

RTL8111C-VB-GR

INTEGRATED GIGABIT ETHERNET CONTROLLER FOR PCI EXPRESS™ APPLICATIONS

Realtek Semiconductor 

RTL8111C

Datasheet

The following figures show how different inductors affect the PIN 1 output waveform. The typical

waveform should look like Figure 16, which has a square waveform with a dip at the falling edge and the

rising edge. If the inductor is not carefully chosen, the waveform may look like Figure 17, where the

waveform looks like a distorted square. This will cause insufficient current supply and will undermine the

stability of the system at gigabit speed. Data in the following figures was measured at gigabit speed.

Figure 16. 4R7GTSD32 (Good)

Figure 17. 1µH Bead (Bad)

Integrated Gigabit Ethernet Controller for PCI Express

29

Track ID: JATR-1076-21 Rev. 1.5

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