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LAN9500AI Datasheet(PDF) 205 Page - Microchip Technology

Part # LAN9500AI
Description  LAN950x USB 2.0 to 10/100 Ethernet Controller
PDF  213 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9500AI Datasheet(HTML) 205 Page - Microchip Technology

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 2010 - 2015 Microchip Technology Inc.
DS00001875A-page 205
LAN950x
Note 8-19
Frequency Deviation Over Time is also referred to as Aging.
Note 8-20
The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as
+/- 50 PPM.
Note 8-21
0oC for commercial version, -40oC for industrial version.
Note 8-22
+70oC for commercial version, +85oC for industrial version.
Note 8-23
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.
8.6.2
100UW 25MHZ CRYSTAL SPECIFICATIONS (LAN9500A/LAN9500AI ONLY)
When utilizing a 100uW 25MHz crystal (LAN9500A/LAN9500Ai only), the following circuit design (Figure 8-11) and
specifications (Table 8-24) are required to ensure proper operation.
FIGURE 8-11:
100UW 25MHZ CRYSTAL CIRCUIT
TABLE 8-24:
100UW CRYSTAL SPECIFICATIONS
Parameter
Symbol
MIN
NOM
MAX
Units
Notes
Crystal Cut
AT, typ
Crystal Oscillation Mode
Fundamental Mode
Crystal Calibration Mode
Parallel Resonant Mode
Frequency
Ffund
-
25.000
-
MHz
Frequency Tolerance @ 25oCFtol
-
-
+/-50
PPM
Note 8-24
Frequency Stability Over Temp
Ftemp
-
-
+/-50
PPM
Note 8-24
Frequency Deviation Over Time
Fage
-
+/-3 to 5
-
PPM
Note 8-25
Total Allowable PPM Budget
-
-
+/-50
PPM
Note 8-26
Shunt Capacitance
CO
--
5
pF
Load Capacitance
CL
8
-
12
pF
Drive Level
PW
-
100
-
uW
Note 8-27
Equivalent Series Resistance
R1
--
80
Ohm
XO Series Resistor
Rs
495
500
505
Ohm
Operating Temperature Range
Note 8-28
-
Note 8-29
oC
LAN950x
56-PIN QFN
XO
XI
RS
Y1
C1
C2



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