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參數(shù)資料
| 型號： | UPD72012 |
| 廠商： | NEC Corp. |
| 英文描述： | HUB CONTROLLER FOR UNIVERSAL SERIAL BUS |
| 中文描述： | 集線器控制器通用串行總線 |
| 文件頁數(shù)： | 23/36頁 |
| 文件大小： | 414K |
| 代理商： | UPD72012 |
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Data Sheet S13918EJ3V0DS
23
μ
PD72012
Recommended Oscillator Circuit Constants
Crystal oscillator (T
A
= 0 to +70
°
C)
Oscillator circuit constant (pF)
Manufacturer
Product name
Frequency (MHz)
C1
C2
AT-49
4.000
10
10
DAISHINKU CORP.
HC-49/U
4.000
9
9
X1
X2
C2
C1
Cautions 1. The oscillator circuit constants, which show the conditions for stabilizing and oscillating,
do not guarantee oscillation frequency accuracy. If the mounting circuit requires oscillation
frequency accuracy, it must be possible to adjust the oscillation frequency of the oscillator
in the mounting circuit. Therefore, ask the manufacturer of the oscillator you use about this
directly.
2. When using an oscillator circuit, wire portions shown using broken lines in the figure as
follows to avoid affecting wire capacitance.
Keep the wiring length as short as possible.
Do not cross the wiring with the other signal lines.
Do not route the wring near a signal line through which a high fluctuating current flows.
Always keep the ground point of the oscillator capacitor to the same potential as V
SS
.
Do not ground the capacitor to a ground pattern in which a high current flows.
Do not fetch signals from the oscillator.
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