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A 120mm2 16Gb 4-MLC NAND Flash Memory with 43nm CMOS Technology

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37 Author(s)

NAND flash memory use in digital still cameras and cellular phones is driving demand for larger-capacity storage. Moreover, NAND flash has the potential to replace HDDs. To achieve larger capacity while maintaining low cost per bit, technical improvements in feature size and area reduction are essential. To meet the stringent requirements, we develop a 16 Gb 4-level NAND flash memory in 43 nm CMOS technology. In 43 nm generation, gate-induced drain leakage (GIDL) influences the electrical field on both sides of NAND strings. GIDL causes severe program disturb problems to NAND flash memories. To avoid GIDL, two dummy wordlines (WL) on both sides of NAND strings are added. This is effective because the dummy gate voltages, are selected independent of the program inhibit voltage.

Published in:

Solid-State Circuits Conference, 2008. ISSCC 2008. Digest of Technical Papers. IEEE International

Date of Conference:

3-7 Feb. 2008