LAN9514 datasheet(46/54 Pages) MICROCHIP

46 / 54 page

LAN9514/LAN9514I

DS00002306A-page 46

 2009-2016 Microchip Technology Inc.

Note 4-13

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 4-14

Frequency Deviation Over Time is also referred to as Aging.

Note 4-15

The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as

+/- 50 PPM.

Note 4-16

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

Note 4-17

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

Note 4-18

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. These two external load capacitors determine the accuracy

of the 25.000 MHz frequency.

LAN9514 Datasheet(PDF) 46 Page - Microchip Technology