Patent ID: 7279918
Filing Date: 2007-10-09
Classification: G01R,G11C

Abstract:
1. A method for storing numbers of failures detected in an integrated circuit (IC) die on a bulk substrate at discrete time intervals during wafer level burn-in, comprising: providing nonvolatile elements for storing wafer level burn-in data in the IC die; providing built-in self-stress (BISS) circuitry in the IC die; providing built-in self-test (BIST) circuitry in the IC die; initially testing the IC die using the BIST circuitry; storing a number of failures detected in the nonvolatile elements; stressing the IC die using the BISS circuitry; testing the IC die using the BIST circuitry; and repeating as stated above until a predetermined number of cycles of wafer level burn-in are completed.