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March 2000

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Sender:
DesignerCouncil <[log in to unmask]>
Subject:
E-Net, USB, 1394 Impedance Requirements
From:
Gregory Kilinski <[log in to unmask]>
Date:
Tue, 14 Mar 2000 14:53:46 -0800
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"DesignerCouncil E-Mail Forum." <[log in to unmask]>, Gregory Kilinski <[log in to unmask]>
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If a PCB is to encompass Ethernet, USB, and 1394 (FireWire), are 3
separate differential impedance pairs required? Here are the
requirements from the respective specs: Ethernet: 90 ohm +/- 15%; USB:
110 +/- 10%; 1394: 110 +/-10%. A PC motherboard designer should be able
to answer this.

Thanks in advance,

[log in to unmask]

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