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DS00001783B-page 15

USB3300

5.1

Piezoelectric Resonator for Internal Oscillator

The internal oscillator may be used with an external quartz crystal or ceramic resonator as described in Section 6.3. See

Table 5-8 for the recommended crystal specifications. See Table 5-1 for the ceramic resonator part number for commer-

cial temperature applications. At this time, the ceramic resonator does not offer sufficient temperature stability to operate

over the industrial temperature range.

Note 5-1

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 5-2

Note 5-3

Note 5-4

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 XI pins are required to accurately calculate the value of the two external load capacitors.

Note 5-5

This is a generic part number assigned by Murata. The oscillating frequency is affected by stray

capacitance on the Printed Circuit Board (PCB). Murata will assign the final part number for each

customer’s PCB after characterizing the customer’s PCB design.

TABLE 5-7:

REGULATOR OUTPUT VOLTAGES

Parameter

Symbol

Condition

MIN

TYP

MAX

Units

Normal Operation

(SuspendM = 1)

1.6

1.8

2.0

V

Low Power Mode

(SuspendM = 0)

0V

1.6

1.8

2.0

V

Note:

TABLE 5-8:

USB3300 QUARTZ CRYSTAL SPECIFICATIONS

Parameter

Symbol

Condition

MIN

TYP

MAX

Units

Crystal Cut

AT, typ

Crystal Oscillation Mode

Fundamental Mode

Crystal Calibration Mode

Parallel Resonant Mode

Frequency

-24-

MHz

Total Allowable PPM Budget

-

-

±500

PPM

Note 5-1

Shunt Capacitance

-7 typ-

pF

Load Capacitance

-

20 typ

-

pF

Drive Level

0.5

-

-

mW

Equivalent Series Resistance

--

30

Ohm

Operating Temperature Range

Note 5-2

-

Note 5-3

USB3300 XI Pin Capacitance

-

3 typ

-

pF

Note 5-4

USB3300 XO Pin Capacitance

-

3 typ

-

pF

Note 5-4

TABLE 5-1:

USB3300 CERAMIC RESONATOR PART NUMBER

Frequency

Murata Part Number

Notes

24 MHz

CSTCE24M0XK1***-R0

Commercial Temp Only, Note 5-5