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FT4222HQ-C-R Datasheet(PDF) 34 Page - Future Technology Devices International Ltd.

Part # FT4222HQ-C-R
Description  USB2.0 to QuadSPI/I2C Bridge IC
PDF  49 Pages
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Manufacturer  FTDI [Future Technology Devices International Ltd.]
Direct Link  http://www.ftdichip.com
Logo FTDI - Future Technology Devices International Ltd.

FT4222HQ-C-R Datasheet(HTML) 34 Page - Future Technology Devices International Ltd.

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Copyright © Future Technology Devices International Limited
34
FT4222H USB2.0 TO QUADSPI/I2C BRIDGE IC
1.3
Document No.: FT_001011 Clearance No.: FTDI#405
7.4
Crystal Oscillator Configuration
Figure 7.4 Recommended FT4222H Crystal Oscillator Configuration
Figure 7.4 illustrates how to connect the FT4222H with a 12MHz ± 0.003% crystal. In this case loading
capacitors should to be added between OSCI, OSCO and GND as shown. A value of 27pF is shown as the
capacitor in the example – this will be good for many crystals but it is recommended to select the loading
capacitor value based on the manufacturer’s recommendations wherever possible. It is recommended to
use a parallel cut type crystal.
It is also possible to use a 12 MHz oscillator with the FT4222H. In this case the output of the oscillator
would drive XSCI, and XSCO should be left unconnected. The oscillator must have a CMOS output drive
capability.
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
XSCI Vin
Input Voltage
2.97
3.30
3.63
V
Fin
Input Frequency
12
MHz
+/- 30ppm
Ji
Cycle to cycle jitter
< 150
ps
Table 7.1 XSCI Input characteristics



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