LM3S8970 Luminary Micro, Inc, LM3S8970 Datasheet - Page 496

• Manufacturer Part Number: LM3S8970
• Description: Lm3s8970 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Electrical Characteristics
496
Table 20-18. Ethernet Reference Crystal
a. If the internal crystal oscillator is used, select a crystal with the following characteristics.
Figure 20-3. External XTLP Oscillator Characteristics
Table 20-19. External XTLP Oscillator Characteristics
a. 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
compensated by selecting the appropriate setting in the Transmit Amplitude Selection (TXO)
bits in the MR19 register.
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
Condition
PPM/yr
PPM
PPM
PPM
MHz
µW
pF
fF
Ω
July 25, 2008