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LAN9500AI データシート(PDF) 206 Page - Microchip Technology

部品番号 LAN9500AI
部品情報  LAN950x USB 2.0 to 10/100 Ethernet Controller
PDF  213 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9500AI データシート(HTML) 206 Page - Microchip Technology

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LAN950x
DS00001875A-page 206
 2010 - 2015 Microchip Technology Inc.
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
The crystal must support 100uW operation to utilize this circuit.
Note 8-28
0oC for commercial version, -40oC for industrial version.
Note 8-29
+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.
XI Pin Capacitance
-
3 typ
-
pF
Note 8-30
XO Pin Capacitance
-
3 typ
-
pF
Note 8-30
TABLE 8-24:
100UW CRYSTAL SPECIFICATIONS (CONTINUED)
Parameter
Symbol
MIN
NOM
MAX
Units
Notes



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