USB7002TSLASHKDX datasheet(47/56 Pages) MICROCHIP

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DS00002670G-page 47

USB7002

9.7.1

CRYSTAL SPECIFICATIONS

It is recommended that a crystal utilizing matching parallel load capacitors be used for the crystal input/output signals

(XTALI/XTALO). Refer to Table 9-9 for the recommended crystal specifications.

6: Frequency Deviation Over Time is also referred to as Aging.

7: 0 °C for commercial version, -40 °C for industrial version.

8: +70 °C for commercial version, +85 °C for industrial version.

9: This number includes the pad, the bond wire and the lead frame. PCB capacitance is not included in this

value. The XTALI/CLK_IN pin, XTALO pin and PCB capacitance values are required to accurately calcu-

late the value of the two external load capacitors. These two external load capacitors determine the accu-

racy of the 25.000 MHz frequency.

9.7.2

EXTERNAL REFERENCE CLOCK (CLK_IN)

When using an external reference clock, the following input clock specifications are suggested:

•25 MHz

• 50% duty cycle ±10%, ±100 ppm

• Jitter < 100 ps RMS

TABLE 9-9:

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

25.000

MHz

Frequency Tolerance @ 25oCFtol

±50

PPM

Frequency Stability Over Temp

Ftemp

±50

PPM

Frequency Deviation Over Time

Fage

±3 to 5

PPM

Note 6

Total Allowable PPM Budget

±100

PPM

Shunt Capacitance

7 typ

Load Capacitance

20 typ

Drive Level

100

Equivalent Series Resistance

Operating Temperature Range

Note 7

Note 8

XTALI/CLK_IN Pin Capacitance

3 typ

Note 9

XTALO Pin Capacitance

3 typ

Note 9

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