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FM3164-GTR データシート(PDF) 10 Page - Cypress Semiconductor

部品番号 FM3164-GTR
部品情報  64-Kbit/256-Kbit Integrated Processor Companion with F-RAM
Download  33 Pages
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メーカー  CYPRESS [Cypress Semiconductor]
ホームページ  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM3164-GTR データシート(HTML) 10 Page - Cypress Semiconductor

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FM3164/FM31256
Document Number: 001-86391 Rev. *C
Page 10 of 33
Layout Recommendations
The X1 and X2 crystal pins employ very high impedance circuits
and the oscillator connected to these pins can be upset by noise
or extra loading. To reduce RTC clock errors from signal
switching noise, a guard ring must be placed around these pads
and the guard ring grounded. SDA and SCL traces should be
routed away from the X1 / X2 pads. The X1 and X2 trace lengths
should be less than 5 mm. The use of a ground plane on the
backside or inner board layer is preferred. See layout example.
Red is the top layer, green is the bottom layer.
Figure 11. Layout Recommendations
Layout for Surface Mount Crystal
(red = top layer, green = bottom layer)
Layout for Through Hole Crystal
(red = top layer, green = bottom layer)
VDD
SCL
SDA
X2
X1
PFI
VBAK
VDD
SCL
SDA
X2
X1
PFI
VBAK


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