A 70 nm 16 Gb 16-Level-Cell NAND flash Memory

Noboru Shibata, K. Isobe, K. Iwasa, M. Nakagawa, M. Fujiu, Tatsuo Shimizu, Mareki Honma, S. Hoshi, T. Kawaai, K. Kanebako,

IEEE Journal of Solid-State Circuits · 2008 · 81 citations · 5 references

Concepts

Abstract

A 16 Gb 16-level-cell (16LC) NAND flash memory using 70 nm design rule has been developed . This 16LC NAND flash memory can store 4 bits in a cell which enabled double bit density comparing to 4-level-cell (4LC) NAND flash, and quadruple bit density comparing to single-bit (SLC) NAND flash memory with the same design rule. New programming method suppresses the floating gate coupling effect and enabled the narrow distribution for 16LC. The cache-program function can be achievable without any additional latches. Optimization of programming sequence achieves 0.62 MB/s programming throughput. This 16-level NAND flash memory technology reduces the cost per bit and improves the memory density even more.

References

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