LM3S9B81 Datasheet, PDF (1101/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Stellaris® LM3S9B81 Microcontroller
Table 25-34. 100BASE-TX Receiver Characteristics (continued)
Parameter Name
Signal detect assertion time
Signal detect de-assertion time
Min
Nom
Max
Unit
-
-
1000
µs
-
-
4
µs
Table 25-35. 10BASE-T Transmitter Characteristics^a
Parameter Name
Peak differential output signal
Harmonic content
Link pulse width
Start-of-idle pulse width
Min
Nom
Max
Unit
2.2
-
2.7
V
27
-
-
dB
-
100
-
ns
-
300
-
ns
350
a. The Manchester-encoded data pulses, the link pulse and the start-of-idle pulse are tested against the templates and using
the procedures found in Clause 14 of IEEE 802.3.
Table 25-36. 10BASE-T Transmitter Characteristics (informative)^a
Parameter Name
Min
Nom
Max
Unit
Output return loss
15
-
-
dB
Output impedance balance
29-17log(f/10)
-
-
dB
Peak common-mode output voltage
-
-
50
mV
Common-mode rejection
-
-
100
mV
Common-mode rejection jitter
-
-
1
ns
a. The specifications in this table are included for information only. They are mainly a function of the external transformer
and termination resistors used for measurements.
Table 25-37. 10BASE-T Receiver Characteristics
Parameter Name
Jitter tolerance (pk-pk)
Input squelched threshold
Differential input resistance
Common-mode rejection
Min
Nom
Max
Unit
30
26
-
ns
340
440
540
mVppd
-
3.6
-
kΩ
25
-
-
V
Table 25-38. Isolation Transformers^a
Name
Value
Condition
Turns ratio
1 CT : 1 CT
+/- 5%
Open-circuit inductance
350 uH (min)
@ 10 mV, 10 kHz
Leakage inductance
0.40 uH (max)
@ 1 MHz (min)
Inter-winding capacitance
25 pF (max)
DC resistance
0.9 Ohm (max)
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.
June 29, 2010
Texas Instruments-Advance Information
1101