Cypress CY7C68013A PCB Layout Recommendations, Vfbga 5 x 5 x 1.0 mm 0.50 Pitch, 0.30 Ball BZ56

CY7C68013A, CY7C68014A

CY7C68015A, CY7C68016A

Package Diagrams (continued)

Figure 39. 56 VFBGA (5 x 5 x 1.0 mm) 0.50 Pitch, 0.30 Ball BZ56 (001-03901)

5.00±0.10

TOP VIEW

PIN A1 CORNER

1 2 3 4 5 6 6 8

A

B

C

D

E

F

G

BOTTOM VIEW

Ø0.05 M C
Ø0.15 M C A	B	A1 CORNER
Ø0.30±0.05(56X)

		8	7	6	5	4	3	2	1
									A
5.00±0.10	3.50	0.50							B
									C
									D
									E
									F
									G

H

5.00±0.10

-B-

-A-

H

0.50

3.50

5.00±0.10

0.210.45

0.10(4X)

SIDE VIEW	C
	0.10
			0.080 C
			REFERENCE JEDEC: MO-195C
-C- SEATING PLANE			PACKAGE WEIGHT: 0.02 grams
	~0.260	1.0 max	001-03901-*B
	0.160

13. PCB Layout Recommendations

Follow these recommendations to ensure reliable high perfor- mance operation:[24]

■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.

■Minimize stubs to minimize reflected signals.

■Connections between the USB connector shell and signal ground must be near the USB connector.

■Bypass and flyback caps on VBus, near connector, are recom- mended.

■DPLUS and DMINUS trace lengths should be kept to within 2 mm of each other in length, with preferred length of 20 to

30 mm.

■Maintain a solid ground plane under the DPLUS and DMINUS traces. Do not allow the plane to split under these traces.

■Do not place 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

24.Source for recommendations: EZ-USB FX2™PCB Design Recommendations, http://www.cypress.com/cfuploads/support/app_notes/FX2_PCB.pdf and High-Speed USB Platform Design Guidelines, http://www.usb.org/developers/docs/hs_usb_pdg_r1_0.pdf.

Document #: 38-08032 Rev. *L Page 59 of 62

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