USB3320 datasheet(16/70 Pages) MICROCHIP

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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

-7 typ-

Load Capacitance

20 typ

Drive Level

0.5

Equivalent Series Resistance

Ohm

Operating Temperature Range

-40

+85

USB3320 REFCLK Pin

Capacitance

-3 typ-

Note 4-11

USB3320 XO Pin Capacitance

3 typ

Note 4-11

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