31 Jul '15, 10pm

IBM Takes A Second Turn at PCM Drift @eetimes @IBM #VLSI2015

The reason for this choice is the IBM authors discovered that for a 2bit/cell PCM the spread of the “10" logic state resistance was relatively small as a function of current, but the spread of the “01" data state resistance of a 2bit/cell always had a wider spread, irrespective of the means used to achieve it. They accounted for this by the observation that the broad spread occurs whenever the current levels are such that melting occurs during either SET or RESET; during RESET it always occurs. However, the SET step is not usually associated with melting as the crystallization temperatures are much lower than the melting temperature.

Full article: http://www.eetimes.com/author.asp?section_id=36&doc_id=13...

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