MIC2555_06 Datasheet, PDF (28/29 Pages) Micrel Semiconductor – USB – OTG Transceiver

Micrel, Inc.
PCB Layout Recommendation
Although the USB standard and applications are not
based in an impedance-controlled environment, a
properly designed PCB layout is recommended for
optimal transceiver performance. The suggested PCB
layout hints are as follows:
• Match signal line traces (VP/VM, D+ D–) and try to
keep them as short as possible.
• For every signal line trace width (w), separate the
signal lines by 1.5-2 widths. Place all other traces at
>2w from all signal line traces.
• Control signal line impedances to ±10%.
• Keep Rseries as close to the IC as possible, with
equal distance between R_series and the IC for both D+
and D–.
MIC2555
December 2006
28
M9999-121406