USB3370 datasheet(15/75 Pages) MICROCHIP

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DS00001915B-page 15

USB3370

4.10

Regulator Output Voltages and Capacitor Requirement

4.11

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. See

Table 4-11 for the recommended crystal specifications.

Note 4-11

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 4-12

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.

Note 4-13

Refer to Section 5.4 and Figure 8-1 for more information.

TABLE 4-10:

REGULATOR OUTPUT VOLTAGES AND CAPACITOR REQUIREMENT

Parameter

Symbol

Conditions

MIN

TYP

MAX

Units

Regulator Output Voltage

VDD33

5.5V > VBAT > 3.0V

2.8

3.3

3.6

USB UART Mode & UART

RegOutput[1:0] = 01

6V > VBAT > 3.0V

2.7

3.0

3.3

USB UART Mode & UART

RegOutput[1:0] = 10

6V > VBAT > 3.0V

2.47

2.75

3.03

USB UART Mode & UART

RegOutput[1:0] = 11

6V > VBAT > 3.0V

2.25

2.5

2.75

Regulator Bypass Capacitor

COUT33

1.0

Bypass Capacitor ESR

CESR33

Ω

Regulator Output Voltage

VDD18

3.6V > VDD33 > 2.25V

1.6

1.8

2.0

Regulator Bypass Capacitor

COUT18

1.0

Bypass Capacitor ESR

CESR18

Ω

TABLE 4-11:

USB3370 QUARTZ CRYSTAL SPECIFICATIONS

Parameter

Symbol

MIN

NOM

MAX

Units

Notes

Crystal Cut

AT, typ

Crystal Oscillation Mode

Fundamental Mode

Crystal Calibration Mode

Parallel Resonant Mode

Frequency

Ffund

-See Product

Identification

System on

page 73

-MHz

Total Allowable PPM Budget

±500

PPM

Note 4-11

Shunt Capacitance

-7 typ-

Load Capacitance

20 typ

Drive Level

0.1

Equivalent Series Resistance

Ohm

USB3370 REFCLK Pin

Capacitance

-3 typ-

Note 4-12

USB3370 XO Pin Capacitance

3 typ

Note 4-12

Recommended Resistance

between XI and XO

Ohm

Note 4-13

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