LM3S9B81 Datasheet, PDF (1102/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Electrical Characteristics
Note: The 100Base-TX amplitude specifications assume a transformer loss of 0.4 dB.
Table 25-39. Ethernet Reference Crystal
Name
Frequency
Frequency tolerance
a
Value
25.00000
±50
Oscillation mode
Parallel resonance, fundamental mode
Parameters at 25° C ±2° C; Drive level = 0.5 mW
Drive level (typ)
50-100
Shunt capacitance (max)
10
Motional capacitance (min)
10
Series resistance (max)
60
Spurious response (max)
> 5 dB below main within 500 kHz
a. This tolerance provides a guard band for temperature stability and aging drift.
Condition
MHz
PPM
µW
pF
fF
Ω
Figure 25-26. External XTLP Oscillator Characteristics
T_r
T_f
T_clkhi
T_clkper
T_clklo
Table 25-40. External XTLP Oscillator Characteristics
Parameter
XTLN_ILV
XTLP_F
T_CLKPER
XTLP_DC
Parameter Name
XTLN Input Low Voltage
XTLP Frequency^a
XTLP Period^a
XTLP Duty Cycle
T_r , T_f
Rise/Fall Time
T_JITTER
Absolute Jitter
a. IEEE 802.3 frequency tolerance ±50 ppm.
Min
Nom
Max
Unit
-
-
0.8
-
-
25.0
-
-
-
40
-
-
40
-
60
%
40
-
-
60
4.0
ns
-
-
0.1
ns
1102
Texas Instruments-Advance Information
June 29, 2010