GD82541PI Datasheet, PDF (26/46 Pages) Intel Corporation – 82541 Family of Gigabit Ethernet Controllers

82541(PI/GI/EI) — Networking Silicon
Table 13. 25 MHz Clock Input Requirements
Symbol
Parameter
Specifications
Min
Typ
Max
Units
Cin
T
Aptp
Vcm
Input capacitance
20
pF
Operating temperature
70
°C
Input clock amplitude (peak-to-peak)
1.0
1.2
1.3
V
Clock common mode
0.6
V
a. Clock jitter is defined according to the recommendations of part 40.6.1.2.5 IEEE 1000BASE-T Standard (at least
10⁵ clock edges, filtered by HPF with cut off frequency 5000 Hz).
Table 14. Reference Crystal Specification Requirements
Specification
Vibrational Mode
Nominal Frequency
Frequency Tolerance
Temperature Stability
Calibration Mode
Load Capacitance
Shunt Capacitance
Equivalent Series Resistance
Drive Level
Aging
Value
Fundamental
25.000 MHz at 25° C
• ±30 ppm recommended
• ±30 ppm required for the 82541GI/EI
• ±50 ppm across the entire operating temperature range
(required by IEEE specifications)
• ±50 ppm at 0° C to 70° C
• ±30 ppm at 0° C to 70° C (required for the 82541GI/EI)
Parallel
• 16 pF to 20 pF
• 18 pF (required for the 82541GI/EI)
6 pF maximum
• 50 Ω maximum
• 20 Ω maximum (required for the 82541GI/EI)
0.5 mW maximum
±5 ppm per year maximum
Table 15. Link Interface Clock Requirements
Symbol
fGTX^a
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
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