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# AR# 24245

## Description

If I have an Industrial temperature grade device, the worst case delays at 100 degrees Celsius are the same as for a Commercial temperature device at 85 degrees Celsius; see (Xilinx Answer 2945) />
If I want to know how fast my Commercial temperature grade device is at 25 degrees Celsius, I can prorate by setting the TEMPERATURE constraint to 25 degrees Celsius.

How do I find out how fast my Industrial temperature grade device would be at 25 degrees Celsius, as it should be faster than the Commercial temperature device at 25 degrees Celsius?

## Solution

The timing values in the speeds files are for Commercial temperature grade devices (whichare 85 degrees Celsius), and these worst-case values still apply to the upper temperature for the Industrial temperature grade devices (whichare 100 degrees Celsius).

If the temperature is dropped by 60 degrees in the Industrial temperature grade device (100 - 60 = 40) or to 40 degrees Celsius, the corresponding temperature for a Commercial temperature grade device (85 - 60 = 25) is 25 degrees Celsius. The TEMPERATURE constraint does then have to be set to 25 degrees Celsius.

If the Industrial temperature grade device must be at room temperature (25 degrees Celsius), the TEMPERATURE constraint should be set to 10 degrees Celsius.

If the Industrial temperature grade device must be at 10 degrees Celsius, the TEMPERATURE constraint should be set to 0 degrees Celsius. The lower end of the constraint is 0, so 0 degrees Celsius represents the Industrial temperature range of 15 to -40 degree Celsius.
AR# 24245
Date 02/01/2013
Status Active
Type General Article
Tools
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