參數(shù)資料
型號(hào): FT2232HQ-TRAY
廠商: Future Technology Devices International Ltd
元件分類(lèi): 總線(xiàn)控制器
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQCC64
封裝: LEAD FREE, QFN-64
文件頁(yè)數(shù): 49/63頁(yè)
文件大?。?/td> 1598K
代理商: FT2232HQ-TRAY
Copyright 2010 Future Technology Devices International Limited
53
Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 2.10
Clearance No.: FTDI#77
6.3 Oscillator Configuration
OSCI
OSCO
2
3
FT2232H
Crystal
12MHz
27pF
Figure 6.5 Recommended FT2232H Crystal Oscillator Configuration.
Figure 6.5 illustrates how to connect the FT2232H 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 manufacturers 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 FT2232H. In this case the output of the oscillator
would drive OSCI, and OSCO should be left unconnected. The oscillator must have a CMOS output drive
capability.
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
OSCI Vin
Input Voltage
2.97
3.30
3.63
V
FIn
Input Frequency
12
MHz
+/- 30ppm
Ji
Cycle to cycle jitter
< 150
pS
Table 6.1 OSCI Input characteristics
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