CY7C68000-56LFXCT Просмотр технического описания (PDF) - Cypress Semiconductor

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Компоненты Описание

производитель

CY7C68000-56LFXCT

TX2™ USB 2.0 UTMI Transceiver

Cypress Semiconductor 

CY7C68000

DIMENSIONS IN MM[INCHES] MIN.

REFERENCE JEDEC MO-220

56-Lead QFN 8 x 8 mm (Sawn Version) LS56B

MAX.

TOP VIEW

SIDE VIEW

BOTTOM VIEW

A

PIN #1

CORNER

7.90[0.311]

8.10[0.319]

1.00[0.039] MAX.

0.08[0.003] C

0.20[0.008] REF.

0.04[0.0015] MAX.

0.18[0.007]

0.28[0.011]

PIN #1

CORNER

0.30[0.012]

0.50[0.020]

E-PAD

(PAD SIZE VARY

BY DEVICE TYPE)

E-PAD maximum size

4.75 X 5.46 mm [187 x 215 mils] (width x length).

C

SEATING

PLANE

6.45[0.254]

6.55[0.258]

0.50[0.020]

12.0

Figure 11-2. 56-lead Quad Flatpack No Lead Package (8 x 8 mm) (SAWN VERSION)

PCB Layout Recommendations[3]

51-85187-*A

The following recommendations should be followed to ensure

reliable high-performance operation.

• At least a four-layer impedance controlled boards are

required to maintain signal quality.

• Specify impedance targets (ask your board vendor what

they can achieve).

• To control impedance, maintain trace widths and trace

spacing 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 capacitors on VBus, near the connector, are

recommended.

• DPLUS and DMINUS trace lengths should 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.

• If possible, do not place any vias on the DPLUS or DMINUS

trace routing.

• Isolate the DPLUS and DMINUS traces from all other signal

traces by no less than 10 mm.

Note:

3. Source for recommendations: EZ-USB FX2™ PCB Design Recommendations, http:///www.cypress.com/cfuploads/support/app_notes/FX2_PCB.pdf High-

Speed USB Platform Design Guidelines, http://www.usb.org/developers/docs/hs_usb_pdg_r1_0.pdf.

Document #: 38-08016 Rev. *H

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