Y. Terada, T. Nakayama, K. Kobayashi, M. Hayashikoshi, S. Kobayashi, Y. Miyawaki, N. Ajika, T. Yoshihara
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High speed page mode sensing scheme for EPROMs and flash EEEPROMs using divided bit line architecture
A novel high-speed page mode sense scheme for EPROMs and flash EEPROMs has been developed. A divided bit line architecture makes it possible to adopt a folded bit line architecture in which sense amplifiers are located at the end of the bit lines. Dynamic sensing avoids the soft write problem by reducing bit line voltage and the current flow through the memory cell. An experimental 1-Mb flash EEPROM using a 0.6-μm design rule has been designed. Simulated results show that a high-speed address access time of 60 ns and a page mode access time of 15 ns can be achieved
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