LM3S6938 Luminary Micro, Inc, LM3S6938 Datasheet - Page 507

• Manufacturer Part Number: LM3S6938
• Description: Lm3s6938 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

July 25, 2008
Table 21-21. Ethernet Reference Crystal
a. If the internal crystal oscillator is used, select a crystal with the following characteristics.
Figure 21-3. External XTLP Oscillator Characteristics
Table 21-22. External XTLP Oscillator Characteristics
a. IEEE 802.3 frequency tolerance ±50 ppm.
b. IEEE 802.3 frequency tolerance ±50 ppm.
Parameters at 25° C ±2° C; Drive level = 0.5 mW
XTLN Input Low Voltage
Parameter Name
XTLP Frequency
XTLP Duty Cycle
Rise/Fall Time
Absolute Jitter
XTLP Period
T
Temperature stability (-40° to 105°)
Temperature stability (-40° to 85°)
r
Motional capacitance (min)
Spurious response (max)
Shunt capacitance (max)
Serious resistance (max)
Frequency tolerance
Oscillation mode
Drive level (typ)
b
Frequency
a
Name
Aging
T
clkhi
Symbol
XTLN
XTLP
T
XTLP
T
clkper
r
, T
DC
T
f
f
f
ILV
T
Min
40
40
clkper
-
-
-
-
-
Nom
25.0
40
-
-
-
-
Preliminary
T
Max
0.8
4.0
0.1
60
60
clklo
-
-
Parallel resonance, fundamental mode
Unit
a
> 5 dB below main within 500 kHz
ns
ns
%
-
-
-
25.00000
50-100
Value
±50
±2
±5
±5
10
10
60
LM3S6938 Microcontroller
Condition
PPM/yr
PPM
PPM
PPM
MHz
µW
pF
fF
Ω
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