LM3S6952 Datasheet, PDF (594/626 Pages) Texas Instruments – Stellaris LM3S6952 Microcontroller

Electrical Characteristics
Table 23-29. Ethernet Reference Crystal^a
Name
Value
Frequency
25.00000
Frequency tolerance
±50
Aging
±2
Temperature stability (-40° to 85°)
±5
Temperature stability (-40° to 105°)
±5
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. If the internal crystal oscillator is used, select a crystal that meets these specifications.
Figure 23-16. External XTLP Oscillator Characteristics
Condition
MHz
PPM
PPM/yr
PPM
PPM
µW
pF
fF
Ω
T_r
T_f
T_clkhi
T_clkper
T_clklo
Table 23-30. External XTLP Oscillator Characteristics
Parameter Name
XTLN Input Low Voltage
XTLP Frequency^a
XTLP Period^b
XTLP Duty Cycle
Symbol
XTLN_ILV
XTLP_f
T_clkper
XTLP_DC
Rise/Fall Time
T_r , T_f
Absolute Jitter
T_JITTER
a. IEEE 802.3 frequency tolerance ±50 ppm.
b. 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
594
April 05, 2010
Texas Instruments-Production Data