LM3S6611 Datasheet, PDF (605/647 Pages) List of Unclassifed Manufacturers – Microcontroller

Stellaris^® LM3S6611 Microcontroller
Table 19-19. I²C Characteristics (continued)
Parameter
No.
Parameter Parameter Name
Min Nom Max
Unit
I4^a
t_DH
Data hold time
2
-
-
system clocks
I5^c
t_SFT
I2CSCL/I2CSDA fall time (V_IH =2.4 V
-
9
10
ns
to V _IL =0.5 V)
I6^a
t_HT
Clock High time
24
-
-
system clocks
I7^a
t_DS
Data setup time
18
-
-
system clocks
I8^a
t_SCSR
Start condition setup time (for repeated 36
-
-
system clocks
start condition only)
I9^a
t_SCS
Stop condition setup time
24
-
-
system clocks
a. Values depend on the value programmed into the TPR bit in the I²C Master Timer Period (I2CMTPR) register; a TPR
programmed for the maximum I2CSCL frequency (TPR=0x2) results in a minimum output timing as shown in the table
above. The I ²C interface is designed to scale the actual data transition time to move it to the middle of the I2CSCL Low
period. The actual position is affected by the value programmed into the TPR; however, the numbers given in the above
values are minimum values.
b. Because I2CSCL and I2CSDA are open-drain-type outputs, which the controller can only actively drive Low, the time
I2CSCL or I2CSDA takes to reach a high level depends on external signal capacitance and pull-up resistor values.
c. Specified at a nominal 50 pF load.
Figure 19-14. I²C Timing
I2
I6
I5
I2CSCL
I1
I4
I7
I8 I3
I9
I2CSDA
19.2.10 Ethernet Controller
Table 19-20. 100BASE-TX Transmitter Characteristics^a
Parameter Name
Peak output amplitude
Output amplitude symmetry
Output overshoot
Rise/Fall time
Rise/Fall time imbalance
Duty cycle distortion
Jitter
a. Measured at the line side of the transformer.
Min
Nom
950
-
98
-
-
-
3
-
-
-
-
-
-
-
Max
1050
102
5
5
500
-
1.4
Unit
mVpk
%
%
ns
ps
ps
ns
Table 19-21. 100BASE-TX Transmitter Characteristics (informative)^a
Parameter Name
Min
Nom
Max
Unit
Return loss
16
-
-
dB
Open-circuit inductance
350
-
-
µH
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.
July 16, 2014
605
Texas Instruments-Production Data