82563EB datasheet(37/52 Pages) INTEL

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82563EB/82564EB Gigabit Platform LAN Connect Networking Silicon

4.7

Crystal

The quartz crystal is strongly recommended as a low cost and high performance choice with the

82563EB/82564EB device. Quartz crystals are the mainstay of frequency control components and

are available from numerous vendors in many package types with various specification options

4.7.1

External Clock Oscillator

If using an external oscillator to provide a clock to the 82563EB/82564EB, the connection shown

in Figure 9 must be used. Note that the XTAL2 output of the 82563EB/82564EB must not be

connected. The XTAL1 input receives the output of the oscillator directly; AC coupling is not

recommended.

Figure 9. External Clock Oscillator Connectivity to 82563EB/82564EB

Table 31. Crystal Parameters

Parameter

Suggested Value

Conditions

Vibrational Mode

Fundamental

Nominal Frequency

25.000 MHz

at 25° C

Frequency Tolerance

•

±30 ppm recommended

•

±50 ppm across the entire operating

temperature range (required by IEEE

specifications)

at 25° C

Temperature Tolerance

±30 ppm

at 0° C to 70° C

Calibration Mode

Parallel

Load Capacitance

27 pF

Shunt Capacitance

6 pF maximum

Equivalent Series Resistance

Ω maximum

at 25 MHz

Drive Level

750

µW

Aging

±5 ppm per year maximum

3.3V

82563EB/82564EB

XTAL1

XTAL2

82563EB Datasheet(PDF) 37 Page - Intel Corporation

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