LM3S8970 Luminary Micro, Inc, LM3S8970 Datasheet - Page 494

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

Electrical Characteristics
20.2.4
494
b. Because I2CSCL and I2CSDA are open-drain-type outputs, which the controller can only actively drive Low, the time
c. Specified at a nominal 50 pF load.
Figure 20-2. I
Ethernet Controller
Table 20-11. 100BASE-TX Transmitter Characteristics
a. Measured at the line side of the transformer.
Table 20-12. 100BASE-TX Transmitter Characteristics (informative)
a. The specifications in this table are included for information only. They are mainly a function of the external transformer
Table 20-13. 100BASE-TX Receiver Characteristics
Parameter Name
Peak output amplitude
Output amplitude symmetry
Output overshoot
Rise/Fall time
Rise/Fall time imbalance
Duty cycle distortion
Jitter
Parameter Name
Return loss
Open-circuit inductance
Parameter Name
Signal detect assertion threshold
Signal detect de-assertion threshold
Differential input resistance
Jitter tolerance (pk-pk)
Baseline wander tracking
Signal detect assertion time
Signal detect de-assertion time
above. The I
period. The actual position is affected by the value programmed into the TPR; however, the numbers given in the above
values are minimum values.
I2CSCL or I2CSDA takes to reach a high level depends on external signal capacitance and pull-up resistor values.
and termination resistors used for measurements.
I2CSDA
I2CSCL
2
2
C interface is designed to scale the actual data transition time to move it to the middle of the I2CSCL Low
C Timing
I1
Min
350
16
0.98
Min
950
Nom
3
-
-
-
-
-
-
I2
Nom
Max
-
-
-
-
-
-
-
Min
600
350
-75
-
-
20
4
-
-
1050
Max
1.02
500
1.4
Unit
Nom
5
5
dB
-
µs
700
425
I4
-
-
-
-
-
Preliminary
mVpk
mVpk
Unit
ns
ps
ps
ns
1000
%
Max
+75
4
-
-
-
mVppd
mVppd
Unit
I6
kΩ
ns
µs
µs
%
I7
a
I5
I8
I3
a
July 25, 2008
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