LAN9500 Datasheet, PDF(206/213 Page) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

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LAN9500 Datasheet, PDF (206/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

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LAN950x

TABLE 8-24: 100UW CRYSTAL SPECIFICATIONS (CONTINUED)

Parameter

Symbol

MIN

NOM

MAX

Units

Notes

XI Pin Capacitance

-

3 typ

-

pF

Note 8-30

XO Pin Capacitance

-

3 typ

-

pF

Note 8-30

Note 8-24

The maximum allowable values for Frequency Tolerance and Frequency Stability are application

dependent. Since any particular application must meet the IEEE +/-50 PPM Total PPM Budget, the

combination of these two values must be approximately +/-45 PPM (allowing for aging).

Note 8-25 Frequency Deviation Over Time is also referred to as Aging.

Note 8-26 The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as

+/- 50 PPM.

Note 8-27

Note 8-28

Note 8-29

The crystal must support 100uW operation to utilize this circuit.

0oC for commercial version, -40oC for industrial version.

+70oC for commercial version, +85oC for industrial version.

Note 8-30

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

in this value. The XO/XI pin and PCB capacitance values are required to accurately calculate the

value of the two external load capacitors (C1 and C2 in Figure 8-11). The external load capacitors,

C1 and C2, determine the accuracy of the 25.000 MHz frequency.

DS00001875A-page 206

ï£ 2010 - 2015 Microchip Technology Inc.

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