H. Kume, M. Kato, T. Adachi, T. Tanaka, T. Sasaki, T. Okazaki, N. Miyamoto, S. Saeki, Y. Ohji, M. Ushiyama, J. Yugami, T. Morimoto, T. Nishida
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A 1.28 mu m/sup 2/ contactless memory cell technology for a 3 V-only 64 Mbit EEPROM
This paper describes a novel contactless memory cell technology for a 3V-only 64Mbit EEPROM with NOR structure. A new program/erase scheme using a Fowler-Nordheim tunneling mechanism is developed, resulting in a single 3V power supply operation. Scatter in "low-level" threshold voltage in a memory array, which seriously affects a read operation margin at a reduced V/sub c/c in the NOR structure, is also improved with this scheme. Based on a 0.4 mu m CMOS process, a small cell area of 1.28 mu m/sup 2/ is successfully realized by the contactless memory cell technology, demonstrating the 64Mbit integration capability.<>
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