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USB3320 数据表(PDF) 16 Page - Microchip Technology

部件名 USB3320
功能描述  Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
PDF  70 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

USB3320 数据表(HTML) 16 Page - Microchip Technology

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USB3320
DS00001792B-page 16
 2014-2015 Microchip Technology Inc.
4.10
Piezoelectric Resonator for Internal Oscillator
The internal oscillator may be used with an external quartz crystal or ceramic resonator as described in Section 5.4.1.2.
See Table 4-11 for the recommended crystal specifications.
Note 4-10
The required bit rate accuracy for Hi-Speed USB applications is ±500 ppm as provided in the USB
2.0 Specification. This takes into account the effect of voltage, temperature, aging, etc.
Note 4-11
This number includes the pad, the bond wire and the lead frame. Printed Circuit Board (PCB)
capacitance is not included in this value. The PCB capacitance value and the capacitance value of
the XO and REFCLK pins are required to accurately calculate the value of the two external load
capacitors.
TABLE 4-11:
USB3320 QUARTZ CRYSTAL SPECIFICATIONS
Parameter
Symbol
Condition
MIN
TYP
MAX
Notes
Crystal Cut
AT, typ
Crystal Oscillation Mode
Fundamental Mode
Crystal Calibration Mode
Parallel Resonant Mode
Frequency
Ffund
-
Table 5-10
-MHz
Total Allowable PPM Budget
-
-
±500
PPM
Note 4-10
Shunt Capacitance
CO
-7 typ-
pF
Load Capacitance
CL
-
20 typ
-
pF
Drive Level
PW
0.5
-
-
mW
Equivalent Series Resistance
R1
--
30
Ohm
Operating Temperature Range
-40
-
+85
oC
USB3320 REFCLK Pin
Capacitance
-3 typ-
pF
Note 4-11
USB3320 XO Pin Capacitance
-
3 typ
-
pF
Note 4-11



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