Table 7-132 PRUSS UART Timing
Conditions
PARAMETER |
MIN |
MAX |
UNIT |
INPUT CONDITIONS |
SRI |
Input slew
rate |
0.5 |
5 |
V/ns |
OUTPUT CONDITIONS |
CL |
Output load
capacitance |
1 |
30(1) |
pF |
(1) This value represents an absolute
maximum load capacitance. As the UART baud rate increases, it may be necessary
to reduce the load capacitance to a value less than this maximum limit to
provide enough timing margin for the attached device. The output rise/fall times
increase as capacitive load increases, which decreases the time data is valid
for the receiver of the attached devices. Therefore, it is important to
understand the minimum data valid time required by the attached device at the
operating baud rate. Then use the device IBIS models to verify the actual load
capacitance on the UART signals does not increase the rise/fall times beyond the
point where the minimum data valid time of the attached device is violated.