DELAY-FAULT TESTING AND DEFECTS IN DEEP SUB-MICRON ICS - DOES CRITICAL RESISTANCE REALLY MEAN ANYTHING?

  • Authors:
  • Will Moore;Guido Gronthoud;Keith Baker;Maurice Lousberg

  • Affiliations:
  • -;-;-;-

  • Venue:
  • ITC '00 Proceedings of the 2000 IEEE International Test Conference
  • Year:
  • 2000

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Abstract

This paper reflects on some recent results that show thevalue of delay-fault tests on a deep sub-micron process.However, the results also suggest that untargetted testpatterns perform almost as well as those targetted on atransition fault model, despite appearing to have a muchlower fault coverage. This leads to an examination of thedefect mechanisms in deep sub-micron ICs, in particularthe relationship of crosstalk and power-rail coupling toresistive opens and resistive bridges. A number of newfault mechanisms are described. The paper shows theimportance of initialization conditions for resistive opensand the importance of noise margins with resistivebridges. These noise margin considerations throw doubtson the idea used by other authors of the "criticalresistance" of a bridge.