Answers Database
M1.4: What temperature was used to obtain the results in the Timing Analyzer/Databook?
Record #4235
Product Family: Software
Product Line: FPGA Implementation
Product Part: Timing Analyzer
Product Version: 1.4
Problem Title:
M1.4: What temperature was used to obtain the results in the Timing Analyzer/Databook?
Problem Description:
Urgency: Standard
General Description:
Military and Industrial temperature grade parts can run over a wider temperature
range than the Commercial parts. As such, customers using the Industrial and
Military parts may wonder if a degredation factor needs to be added to the values
given by the Timing Analyzer if they are to run the parts at a high temperature.
Solution 1:
The answer is that they do not.
The Timing Analyzer uses worst case delays on parts that are running within specification.
The same applies to the values given in the Databook.
The difference between the different temperature graded parts is that the Military
and Industrial parts will run at the same speed as the Commercial equivalent, but
at higher temperatures and at lower voltages. In other words their performance
is guarenteed over a wider range of operating conditions.
For example:
If we take the XC4010XL-3 part, Tgls = 3.2ns (max)
What this means is that Tgls for this part will never exceed 3.2ns as long as the
device is run within spec.
For a commercial part, this means that VCC=3.0V, Junction Temperature = +85 degrees
For an industrial part, this means that VCC=3.0V, Junction Temperature = +100 degrees
(Parts run slowest at low Vcc and High temperature.)
End of Record #4235 - Last Modified: 05/24/99 12:13 |
