Abstract

A 32 Mb NAND type flash EEPROM has been developed with 0.425 /spl mu/m CMOS technology. A 35 ns cycle time is achieved by adopting a pipeline scheme. A boosted word-line scheme and a program verify operation achieving tight threshold voltage (Vth) distribution of programmed cells reduce read-out access time. Multiple block erase operation is realized by adopting erase block registers. All functions are operable with a single 5.3 V or 5 V power supply.

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