1. Backside Device Irradiation for Single Event Upset Tests of Advanced Devices Gary M. Swift Jet Propulsion Laboratory/ California Institute of Technology SEE Symposium Session E: Testing and Facility April 25, 2002 The work described in this presentation was conducted at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not constitute or imply its endorsement by the United States Government or the Jet Propulsion Laboratory, California Institute of Technology.

3. Acknowledgements Thanks to the following Radiation Effects Group members: for the SDRAM data – Dr. Leif Scheick and Duc Nguyen for PowerPC data – Farhad Farmanesh, Steve Guertin, Dr. Farokh Irom, and Doug Millward for technical support – Michael O’Connor, Mike Weideman, and Peter Schrock for general support – Allan Johnston

4. Outline Background: How and Why? Review of two RADECS examples SDRAM PowerPC “Interesting” examples Pioneering data sets Beam problems Procedure problems Conclusions

5. Background: Why? Two reasons are: SDRAMs Flip-Chips picture source: http://www.motorola.com

6. Background: How?

7. Example results:

8. RADECS example: SDRAM

9. RADECS example: PowerPC

10. Pioneering Example: Koga, Crain et al. Front-side Samsung 256Mb SDRAM

11. Pioneering Example: Koga, Crain et al. Backside Samsung 256Mb SDRAM

12. Pioneering Example: Koga, Crain et al. Backside Front-side

13. Example: Beam Problems PowerPC G4

14. Example: Procedure Problems 1 2 3 LET= 7.6 Upsets =2,400 LET= 13 Upsets =10,000 LET= ?? Upsets =29,200

15. Conclusions Texas A&M Wishlist: - Upstream Degrader (for uniformity) - LET and/or Energy Spectrum Detector Backside thinning is NOT so easy - Yield Problems - Need Long-Range Ions Backside Irradiation Requires Careful LET Assignments

16. Pioneering Example: Henson et al.