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AR# 57193

Design Advisory for Artix-7, Kintex-7, Virtex-7, Zynq-7000 Packaging - The 7 Series Thermal Resistance Values (Theta-JA, Theta-JB, and Theta-JC) are being updated with more accurate values, many of which are substantially changed

Description

The thermal resistance values for Theta-JA, Theta-JB, and Theta-JC are being updated for the Zynq-7000, Artix-7, Kintex-7, and Virtex-7 family devices. For many packages, the thermal resistance numbers will increase, adversely impacting thermal dissipation estimates. These incorrect values are also propagated through the Xilinx Power Estimator Spreadsheet (XPE) prior to 2013.3, so customers who leveraged this tool to estimate thermal aspects of power dissipation will be impacted.

Solution

For many 7 series devices (Artix-7, Kintex-7, Virtex-7, and Zynq-7000 familes), the thermal resistance values (Theta-JA, Theta-JB, and Theta-JC) were incorrectly extracted and were documented with inaccurate values. Updated thermal resistance values have been released and are documented starting in version 1.10 of the 7 Series Packaging and Pinout Product Specification User Guide (UG475), version 1.3 of the Zynq-7000 All Programmable SoC Packaging and Pinout Product Specification User Guide (UG865), the thermal lookup tool (after 8/26/2013): http://www.xilinx.com/cgi-bin/thermal/thermal.pl, and the 2013.3 Xilinx Power Estimator Spreadsheet (XPE).

For customers who leverage thermal resistance values to model the thermal performance of their system, it is recommended that thermal analysis is re-run with the updated thermal resistance numbers.

Customers who analyzed their system with Delphi-format compact thermal models are not required to re-analyze their system, as that model is not impacted by this issue.

Xilinx generates three different thermal models:

  1. Detailed 3-D Flotherm model
    1. Not generally distributed to customers
    2. Validated with thermal measurements
    3. Used to validate Delphi and 2-resistor models
  2. Delphi-format model
    1. Distributed to customers
    2. No errors in this model for 7 series devices
    3. Derived from the Detailed 3-D model
  3. 2-resistor model
    1. Distributed to customers
    2. Theta J values published in user guide
    3. This model and Theta values are erroneous


Thermal resistance numbers are primarily used to estimate the heat dissipation of a system:

  • Theta-JC (JC) measures the heat flow resistance between the die surface and the surface of the package (case). Theta-JC is used primarily in estimating heat dissipation in a system that leverages a heat sink or other method beyond the device package.
  • Theta-JA (JA) measures the heat flow resistance between the die surface and ambient. Theta-JA is often used to estimate the junction temperature that will result when estimating the power that an IC will consume in a system with just the IC and a environment specified by JEDEC.
  • Theta-JB (JA) measures the heat flow resistance between the die surface and the Printed Circuit Board.  
 
The following tables quantify the percentage change to the thermal numbers compared to previously published values (negative % changes represent an improved thermal resistance value).
Artix Device Package Old Theta-JC New Theta-JC % change to Theta-JC Old Theta-JB New Theta-JB % change to Theta-JB Old Theta-JA New Theta JA % change to Theta-JA
XC7A100T CS324 3.23 3.25 0.6% 5.8 5.7 -1.7% 18.3 18.2 -0.5%
XC7A100T FT256 3.33 3.34 0.3% 6.9 6.9 0.0% 18.2 18.2 0.0%
XC7A200T SB484 0.06 0.08 33.3% 4.9 5 2.0% 14.8 14.8 0.0%
XC7A200T FB484 0.06 0.08 33.3% 4.8 4.8 0.0% 13.9 13.9 0.0%
XC7A100T FG484 3.82 3.85 0.8% 6.8 6.8 0.0% 16.1 15.8 -1.9%
XC7A200T FB676 0.07 0.08 14.3% 4.6 4.7 2.2% 13 13 0.0%
XC7A100T FG676 3.67 3.71 1.1% 6.7 6.8 1.5% 15.3 15 -2.0%
XC7A200T FF1156 0.3 0.32 6.7% 2.6 2.6 0.0% 9.1 9.3 2.2%
Kintex Device Package Old Theta-JC New Theta-JC % change to Theta-JC Old Theta-JB New Theta-JB % change to Theta-JB Old Theta-JA New Theta JA % change to Theta-JA
XC7K70T FB484 0.16 0.13 -18.8% 6.5 6.8 4.6% 15.9 16.4 3.1%
XC7K160T FB484 0.07 0.1 42.9% 5 5.3 6.0% 13.6 14.6 7.4%
XC7K70T FB676 0.16 0.13 -18.8% 6.5 6.7 3.1% 15.8 15.7 -0.6%
XC7K160T FB676 0.07 0.1 42.9% 5 5.2 4.0% 14 14 0.0%
XC7K325T FB676 0.04 0.06 50.0% 4.1 4.2 2.4% 13.1 12.9 -1.5%
XC7K410T FB676 0.03 0.05 66.7% 3.5 3.7 5.7% 11.9 12.2 2.5%
XC7K160T FF676 0.38 0.41 7.9% 4 4 0.0% 11.8 11.7 -0.8%
XC7K325T FF676 0.23 0.26 13.0% 3.6 3.5 -2.8% 10 11.1 11.0%
XC7K410T FF676 0.17 0.2 17.6% 3.3 3.3 0.0% 9.7 10.9 12.4%
XC7K325T FB900 0.04 0.06 50.0% 4.1 4.3 4.9% 11.9 12 0.8%
XC7K410T FB900 0.03 0.05 66.7% 3.6 3.7 2.8% 10.7 11.4 6.5%
XC7K325T FF900 0.24 0.26 8.3% 2.6 2.8 7.7% 8.6 9.7 12.8%
XC7K410T FF900 0.19 0.19 0.0% 2.4 2.6 8.3% 8.2 9.5 15.9%
XC7k355T FF901 0.2 0.23 15.0% 3.2 3.2 0.0% 8.2 10 22.0%
XC7k420T FF901 0.19 0.17 -10.5% 3.2 2.9 -9.4% 8.1 9.6 18.5%
XC7K480T FF901 0.15 0.17 13.3% 2.9 2.9 0.0% 7.6 9.6 26.3%
XC7K420T FF1156 0.19 0.17 -10.5% 3.2 2.4 -25.0% 7.3 8.7 19.2%
XC7K480T FF1156 0.16 0.17 6.3% 2.2 2.4 9.1% 6.8 8.7 27.9%
Virtex-7T Device Package Old Theta-JC New Theta-JC % change to Theta-JC Old Theta-JB New Theta-JB % change to Theta-JB Old Theta-JA New Theta JA % change to Theta-JA
XC7V585T FF1157 0.05 0.14 180.0% 2.3 2.3 0.0% 8.7 8.7 0.0%
XC7V585T FF1761 0.05 0.11 120.0% 2.2 2.1 -4.5% 7.6 7.6 0.0%
XC7V2000T FH1761 0.04 0.05 25.0% 3.3 2 -39.4% 7 7 0.0%
XC7V2000T FL1925 0.04 0.06 50.0% 1.6 1.7 6.2% 6.9 6.9 0.0%
XC7VX330T FF1157 0.18 0.19 5.6% 2.3 2.5 8.7% 7.4 8.9 20.3%
XC7VX415T FF1157 0.14 0.16 14.3% 2.1 2.3 9.5% 7 8.8 25.7%
XC7VX485T FF1157 0.13 0.13 0.0% 2.1 2.3 9.5% 9 8.7 -3.3%
XC7VX690T FF1157 0.04 0.09 125.0% 2 2.3 15.0% 6.1 8.7 42.6%
XC7VX415T FF1158 0.13 0.16 23.1% 2.2 2.3 4.5% 6.8 8.8 29.4%
XC7VX485T FF1158 0.13 0.13 0.0% 2.1 2.3 9.5% 9 8.7 -3.3%
XC7VX550T FF1158 0.09 0.09 0.0% 2.1 2.3 9.5% 6.5 8.7 33.8%
XC7VX690T FF1158 0.03 0.09 200.0% 1.9 2.3 21.1% 6.2 8.7 40.3%
XC7VX330T FF1761 0.19 0.19 0.0% 2.3 2.3 0.0% 6.4 7.8 21.9%
XC7VX485T FF1761 0.11 0.13 18.2% 1.9 2.1 10.5% 7.8 7.6 -2.6%
XC7VX690T FF1761 0.08 0.09 12.5% 1.8 1.9 5.6% 5.6 7.5 33.9%
XC7VX690T FF1926 0.08 0.09 12.5% 1.8 1.9 5.6% 5.1 7.1 39.2%
XC7VX980T FF1926 0.04 0.09 125.0% 1.7 1.8 5.9% 4.8 7.1 47.9%
XC7VX415T FF1927 0.14 0.16 14.3% 1.8 2.1 16.7% 5.6 7.4 32.1%
XC7VX485T FF1927 0.11 0.13 18.2% 1.9 2 5.3% 7.4 7.3 -1.4%
XC7VX550T FF1927 0.09 0.09 0.0% 1.8 1.8 0.0% 5.4 7.1 31.5%
XC7VX690T FF1927 0.07 0.09 28.6% 1.7 1.8 5.9% 4.9 7.1 44.9%
XC7VX980T FF1928 0.04 0.09 125.0% 1.7 1.8 5.9% 4.8 7.1 47.9%
XC7VX485T FF1930 0.1 0.13 30.0% 1.9 2 5.3% 7.4 7.3 -1.4%
XC7VX690T FF1930 0.08 0.09 12.5% 1.8 1.9 5.6% 5.4 7.1 31.5%
XC7VX980T FF1930 0.04 0.09 125.0% 1.7 1.8 5.9% 5 7.1 42.0%
XC7VX1140T FL1926 0.04 0.06 50.0% 1.6 1.7 6.2% 6.9 6.9 0.0%
XC7VX1140T FL1928 0.04 0.06 50.0% 1.6 1.7 6.2% 6.9 6.9 0.0%
XC7VX1140T FL1930 0.04 0.06 50.0% 1.6 1.7 6.2% 6.9 6.9 0.0%
XC7VH580T HC1155 0.09 0.1 11.1% 1.8 2.4 33.3% 6.2 8.7 40.3%
XC7VH580T HC1931 0.04 0.08 100.0% 0.7 1.8 157.1% 5.1 7 37.3%
XC7VH580T HC1932 0.04 0.08 100.0% 0.7 1.8 157.1% 5.2 7 34.6%
Zynq Device Package Old Theta-JC New Theta-JC % change to Theta-JC Old Theta-JB New Theta-JB % change to Theta-JB Old Theta-JA New Theta JA % change to Theta-JA
xc7z010 CL225 4.9 4.95 1.0% 11.6 11.6 0.0% 25.4 25.4 0.0%
xc7z010 CL400 4 4.52 13.0% 10 9.3 -7.0% 20.9 20.9 0.0%
XC7Z020 CL400 3.1 3.44 11.0% 8 7.4 -7.5% 18.7 19 1.6%
XC7Z020 CL484 3 3.35 11.7% 8 7.4 -7.5% 17.9 18.2 1.7%
XC7Z030 FB484 0.1 0.1 0.0% 5.4 5.7 5.6% 14.3 15.2 6.3%
XC7Z030 FB676 0.1 0.1 0.0% 6.2 5.6 -9.7% 14.2 14.5 2.1%
XC7Z045 FB676 0.05 0.06 20.0% 5.2 4 -23.1% 12.2 12.6 3.3%
XC7Z030 FF676 0.43 0.46 7.0% 4.1 3.6 -12.2% 10.9 11.5 5.5%
XC7Z045 FF676 0.25 0.23 -8.0% 3.7 3.4 -8.1% 9.6 11 14.6%
XC7Z045 FF900 0.27 0.23 -14.8% 2.7 2.7 0.0% 8.3 9.6 15.7%


Revision History
09/12/2013 - Initial release

Linked Answer Records

Master Answer Records

AR# 57193
Date Created 08/21/2013
Last Updated 09/12/2013
Status Active
Type Design Advisory
Devices
  • Artix-7
  • Kintex-7
  • Virtex-7
  • Zynq-7000
Tools
  • ISE Design Suite - 14
  • Vivado Design Suite