82541ER 查看數據表（PDF） - Intel
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82541ER Datasheet PDF : 51 Pages
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82541ER Gigabit Ethernet Controller
Table 14. Reference Crystal Specification Requirements
Specification
Vibrational Mode
Nominal Frequency
Frequency Tolerance
Temperature Stability
Calibration Mode
Load Capacitance
Shunt Capacitance
Series Resistance, Rs
Drive Level
Aging
Insulation Resistance
Value
Fundamental
25.000 MHz at 25° C
±30 ppm
±30 ppm at 0° C to 70° C
Parallel
20 pF to 24 pF
6 pF maximum
50 W maximum
0.5 mW maximum
±5.0 ppm per year maximum
500 MΩ at DC 100 V
Table 15. Link Interface Clock Requirements
Symbol
fGTXa
Parameter
GTX_CLK frequency
a. GTX_CLK is used externally for test purposes only.
Min
Typ
Max
Unit
125
MHz
Table 16. EEPROM Interface Clock Requirements
Symbol
fSK
Parameter
Microwire EEPROM Clock
SPI EEPROM Clock
Min
Typ
Max
Unit
1
MHz
2
MHz
Table 17. AC Test Loads for General Output Pins
Symbol
Signal Name
CL
TDO
CL
SDP[3:0]
CL
EEDI, EESK
CL
LED[3:0]
Value
10
16
18
20
Units
pF
pF
pF
pF
22
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