Improved Array Architectures of DINOR for 0.5 µm 32 M and 64 Mbit Flash Memories

Hiroshi ONODA, Yuichi KUNORI, Kojiro YUZURIHA, Shin-ichi KOBAYASHI, Kiyohiko SAKAKIBARA, Makoto OHI, Atsushi FUKUMOTO, Natsuo AJIKA, Masahiro HATANAKA, Hirokazu MIYOSHI

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Summary :

A novel operation of a flash memory cell, named DINOR (DIvided bit line NOR) operation, is proposed. This operation is based on gate-biased FN programming/FN erasing, and we found that it satisfies all basic cell characteristics such as program/erase, disturb immunity and a cycling endurance. Making a good use of this cell operation, we also proposed a new array structure applied to DINOR type cell whose bit line is divided into the main and sub bit line, having 1.82 µm2 cell size, suitable for 32 Mbit flash memory based on 0.5 µm CMOS process. In the last part of this paper, the useful and practical application of the DINOR operation to a virtual ground array architecture, realizing 1.0 µm2 cell size for a 0.5 µm 64 Mbit flash memory, is described.

Publication
IEICE TRANSACTIONS on Electronics Vol.E77-C No.8 pp.1279-1286
Publication Date
1994/08/25
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Section on High Speed and High Density Multi Functional LSI Memories)
Category
Non-volatile Memory

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