CY7C68300C CYPRESS [Cypress Semiconductor], CY7C68300C Datasheet - Page 39

• Manufacturer Part Number: CY7C68300C
• Manufacturer: CYPRESS [Cypress Semiconductor]

Document 001-05809 Rev. *A
Package Diagrams
Figure 14. 56-Lead QFN 8 x 8 mm LF56A
General PCB Layout Recommendations For USB Mass Storage Designs
The following recommendations must be followed to ensure
reliable high-performance operation:
• Use at least a four-layer, impedance controlled board to
• Specify specific impedance targets (ask your board vendor
• Maintain uniform trace widths and trace spacing to control
• Minimize reflected signals by avoiding using stubs and vias.
• Connect the USB connector shell and signal ground as near
• Use bypass/flyback capacitors on VBUS near the
maintain signal quality.
what they can achieve).
impedance.
to the USB connector as possible.
connector.
0.80[0.031]
NOTE:
DIA.
OPTION FOR CML - BOTTOM VIEW
DIMENSIONS ARE SAME WITH STD DWG ON UPPER RIGHT EXCEPT
FOR THE U-GROOVE ON THE PADDLE
A
1
2
DIMENSIONS IN MM[INCHES] MIN.
REFERENCE JEDEC MO-220
N
(PAD SIZE VARY
BY DEVICE TYPE)
E-PAD
7.90[0.311]
8.10[0.319]
TOP VIEW
7.70[0.303]
7.80[0.307]
(continued)
N
1
2
MAX.
1.925
2.175
2.275
.000
.680
U-GROOVE DIMENSION
R.400
R.200
PIN #1 ID
R.300
R.400
R.300
R.500
R.600
R.100
0.80[0.031] MAX.
1.00[0.039] MAX.
SIDE VIEW
.240TYP
0°-12°
R.200
R.100
R.250
(3X)
C
0.05[0.002] MAX.
0.20[0.008] REF.
0.08[0.003]
SEATING PLANE
2.375
1.975
2.075
• Keep DPLUS and DMINUS trace lengths to within 2 mm of
• Maintain a solid ground plane under the DPLUS and
• Do not place vias on the DPLUS or DMINUS trace routing
• Isolate the DPLUS and DMINUS traces from all other signal
• Source for recommendations:
each other in length, with a preferred length of 20–30 mm.
DMINUS traces. Do not allow the plane to be split under
these traces.
for a more stable design.
traces by no less than 10 mm.
• EZ-USB FX2LP PCB Design Recommendations
• High-speed USB Platform Design Guidelines
C
http://www.cypress.com
http://www.usb.org
0.30[0.012]
0.50[0.020]
CY7C68300C/CY7C68301C
CY7C68320C/CY7C68321C
6.45[0.254]
6.55[0.258]
BOTTOM VIEW
(PAD SIZE VARY
BY DEVICE TYPE)
E-PAD
0.18[0.007]
0.28[0.011]
0.50[0.020]
51-85144 *F
N
1
2
PIN1 ID
0.20[0.008] R.
0.24[0.009]
0.60[0.024]
0.45[0.018]
Page 39 of 42
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