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Micron reinforces stand on phase-change memory

Posted: 03 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:phase-change memory? 45nm?

Micron Technology Inc. has confirmed its support for the phase-change memory product line and R&D inherited when it acquired Numonyx BV in May 2010. But a company executive declined to give further details of its technology roadmap or how it plans to scale the technology below the 45nm node.

An article by Micron senior fellow Greg Atwood contributed to EE Times, entitled The evolution of phase-change memory, has excited considerable response as well as a counterpoint article entitled Phase-change memory: A rebuttal of Micron's article.

When asked if Micron continued to support phase-change memory Ed Doller, vice president and chief memory systems architect with Micron and formerly chief technology officer with Numonyx, told EE Times: "Absolutely I can confirm that." He added that 80 to 90 percent of the staff that report to him are working on phase-change memory.

Phase-change memory has shown promise as a potential non-volatile replacement for flash memory and DRAM but the technology has been slow to make it out of the laboratory. As the situation stands, phase-change memory is behind the rival technologies in terms of both memory capacity in bits and the cost of manufacture. This has given rise to speculation that the technology may be a curiosity that ultimately fails to impact the market. Micron has one phase-change memory product line that customers can buy; the Omneo 128Mbit device implemented using a 90nm process technology but Numonyx, and now Micron, have yet to produce a promised follow-on 1Gb memory using a 45nm process technology.

When asked if Micron would respond directly to the technical questions posed within the Internet pages of EE Times, Doller said that Micron has put some technical information in the public domain through the presentation of papers at conferences such as the International Electron Devices Meeting and that other technical material it shares with companies under non-disclosure agreements.

Doller did not disagree with the statement that other memory technologies are already down at 3xnm and heading for 2xnm so that for PCM to have a future it must compete at those geometries and beyond.

Doller responded: "There will be challenges but we are on a path to scale the technology further than any of the incumbents, by which I mean NOR, NAND and DRAM." He declined to discuss detailed solutions to the challenges to the scalability of PCM. These could include the non-scaling of current density, electro-migration and thermal cross-talk, amongst others.

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