Patent ID: 7715260
Filing Date: 2010-05-11
Classification: G11C

Abstract:
1. An operating voltage tuning method for an SRAM, wherein the SRAM receives a periphery voltage and a memory cell voltage and the steps of the method comprise: performing a shmoo test on a plurality of the SRAM and thereby obtaining a shmoo test plot and a minimum operating voltage, wherein the shmoo test plot has a successful test distribution zone; comparing the minimum operating voltage with a preset specification; positioning a specification position point where the preset specification is located on a line in the shmoo test plot on which the periphery voltage is equal to the memory cell voltage; fixing one of the periphery voltage and the memory cell voltage and gradually decreasing the other to test the plurality of the SRAM and thereby obtain a failure bits distribution; and tuning process parameters of the plurality of the SRAM according to the specification position point and the failure bits distribution.