Micrel, Inc. MIC2555
December 2006 28
M9999-121406
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–.
Micrel, Inc. MIC2555
December 2006 29
M9999-121406
Package Information
24-Pin MLF (ML)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.

MIC2555-0YML-TR

Mfr. #:
Manufacturer:
Microchip Technology / Micrel
Description:
USB Interface IC USB Transceiver
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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