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A 146-mm2 8-gb multi-level NAND flash memory with 70-nm CMOS technology

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25 Author(s)
Hara, T. ; SoC R&D Center, Toshiba Corp. Semicond. Co., Kanagawa, Japan ; Fukuda, K. ; Kanazawa, K. ; Shibata, N.
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An 8-Gb multi-level NAND Flash memory with 4-level programmed cells has been developed successfully. The cost-effective small chip has been fabricated in 70-nm CMOS technology. To decrease the chip size, a one-sided pad arrangement with compacted core architecture and a block address expansion scheme without block redundancy replacement have been introduced. With these methods, the chip size has been reduced to 146 mm2, which is 4.9% smaller than the conventional chip. In terms of performance, the program throughput reaches 6 MB/s at 4-KB page operation, which is significantly faster than previously reported and very competitive with binary Flash memories. This high performance has been achieved by the combination of the multi-level cell (MLC) programming with write caches and with the program voltage compensation technique for neighboring select transistors. The read throughput reaches 60 MB/s using 16I/O configuration.

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Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 1 )