LM3S6611 Datasheet, PDF (607/647 Pages) List of Unclassifed Manufacturers – Microcontroller

Stellaris^® LM3S6611 Microcontroller
Table 19-26. Isolation Transformers (continued)
Name
Value
Condition
Insertion loss
0.4 dB (typ)
0-65 MHz
HIPOT
1500
Vrms
a. Two simple 1:1 isolation transformers are required at the line interface. Transformers with integrated common-mode
chokes are recommended for exceeding FCC requirements. This table gives the recommended line transformer
characteristics.
Note:
The 100Base-TX amplitude specifications assume a transformer loss of 0.4 dB. For the
transmit line transformer with higher insertion losses, up to 1.2 dB of insertion loss can be
compensated by selecting the appropriate setting in the Transmit Amplitude Selection (TXO)
bits in the MR19 register.
Table 19-27. Ethernet Reference Crystal^a
Name
Value
Frequency
Frequency tolerance^b
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. If the internal crystal oscillator is used, select a crystal that meets these specifications.
b. This tolerance provides a guard band for temperature stability and aging drift.
Condition
MHz
PPM
µW
pF
fF
Ω
Figure 19-15. External XTLP Oscillator Characteristics
T_r
T_f
T_clkhi
T_clkper
T_clklo
Table 19-28. External XTLP Oscillator Characteristics
Parameter Name
XTLN Input Low Voltage
Symbol
XTLN_ILV
Min
Nom
Max
Unit
-
-
0.8
-
July 16, 2014
607
Texas Instruments-Production Data