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Trends in High-Density Flash Memory Technologies
Takashi KOBAYASHI Hideaki KURATA Katsutaka KIMURA
IEICE TRANSACTIONS on Electronics
Publication Date: 2004/10/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on New Era of Nonvolatile Memories)
Category: Flash Memory
flash memory, high density, AG-AND, multilevel, high-speed programming,
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This paper reviews process, device and circuit technologies of high-density flash memories, whose market has grown explosively as bridge media. In this memory, programming throughput as well as low bit costs is critical issue. To meet the requirements, we have developed multi-level AG (Assist Gate)-AND type flash memory with small effective cell size and 10 MB/s programming throughput. We clarify three challenges to the multilevel flash memory in terms of operation method, high reliability for data retention, and high-speed multilevel programming. Future trends of high-density flash memories are also discussed.