CY7C68053
Document # 001-06120 Rev *F Page 38 of 39
© Cypress Semiconductor Corporation, 2006. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be
used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
12.0 PCB Layout Recommendations
The following recommendations must be followed to ensure
reliable high-performance operation.
• At least a four-layer impedance controlled board is required
to maintain signal quality.
• Specify impedance targets (ask your board vendor what
they can achieve).
• To control impedance, maintain trace widths and trace spac-
ing to within specifications.
• Minimize stubs to minimize reflected signals.
• Connections between the USB connector shell and signal
ground must be done near the USB connector.
• Bypass/flyback caps on VBus, near connector, are recom-
mended.
• DPLUS and DMINUS trace lengths must be kept to within
2 mm of each other in length, with preferred length of
20–30 mm.
• Maintain a solid ground plane under the DPLUS and
DMINUS traces. Do not allow the plane to be split under
these traces.
• It is preferable to have no vias placed on the DPLUS or
DMINUS trace routing.
• Isolate the DPLUS and DMINUS traces from all other signal
traces by no less than 10 mm.
Purchase of I2C components from Cypress, or one of its sublicensed Associated Companies, conveys a license under the Philips
I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification
as defined by Philips. MoBL-USB FX2LP18, EZ-USB FX2LP and ReNumeration are trademarks, and MoBL-USB is a registered
trademark, of Cypress Semiconductor Corporation. All product and company names mentioned in this document are the trade-
marks of their respective holders.
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