82567 Datasheet, PDF(17/33 Page) Intel Corporation – GbE Physical Layer Transceiver (PHY)

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82567 Datasheet, PDF (17/33 Pages) Intel Corporation – GbE Physical Layer Transceiver (PHY)

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Datasheetâ82567

4.4

Crystal Specifications

Following are the recommended crystal specifications for operation with the 82567.

Parameter Name

Symbol

Recommended Value Max/Min Range

Conditions

Frequency

Vibration mode

25.000 MHz

Fundamental

@25 Â°C

Cut

Operating/Calibration

Mode

Frequency Tolerance

Temperature Tolerance

Operating Temperature

Non Operating

Temperature

ïf/fo @25Â°C

ïf/fo

Topr

Parallel

Â±30 ppm

-20 to +70 Â°C

-40 to +90 Â°C

Note 1

@25 Â°C

Equivalent Series

Resistance (ESR)

40 ï

50 ï

@25 MHz

Load Capacitance

Cload

18 pF (max 24 pF)

Note 1

Shunt Capacitance

6 pF

Note 1

Pullability from Nominal

Load Capacitance

ïf/Cload

15 ppm/pF max

Max Drive Level

Insulation Resistance

300 ïW

500 Mï min

Note 4

@ 100 VDC

Aging

Differential Board

Capacitance

Board Capacitance

External Capacitors

Board Resistance

ïf/fo

C1, C2

Â±5 ppm per year

2 pF

Note 2

4 pF

27 pF

0.1 ï

Note 3

Note 1

1ï

1. When not using values within 1% of the recommended values, the following procedures must be used:

1. On the board with the crystal and the 82567, measure the clock at the output of the receive and transmit

lines.

CEnhsaunrgeetChe1

adnedmCan2 dtoonmteheet

with the 25 MHz requirement.

25 MHz clock has a deviation of

less

than

ppm

(for

example,

MHz

750

Hz).

4. If the measured

capacitors.

frequency

higher

then

25.00075

MHz,

replace

capacitors

and

with

larger

5. If the measured frequency is lower then 24.99925 MHz, replace capacitors C1 and C2 with smaller

capacitors.

2. Differential board capacitance is the capacitance between Ser_CLK_PLUS and Ser_CLK_MINUS.

3. Board capacitance is the differential capacitance between the input and output. This parasitic capacitance

must be less than or equal to the specification. This value can change up to 10%. The procedures listed in

footnote â1â must be followed to comply with the ppm specification.

4. Crystal must meet or exceed the specified drive level (DL). A crystal with a specified drive level of less than

300 ïW does not meet this requirement.

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