Nonvolatile semiconductor storage device and semiconductor devic

Details Nonvolatile semiconductor storage device and semiconductor devic Nonvolatile semiconductor storage device and semiconductor devic

1995-06-05

1996-07-23

Nelms, David C.

Static information storage and retrieval

Floating gate

Particular biasing

365201, 365208, 36518509, G11C 700

Patent

active

055396895

ABSTRACT:
A nonvolatile semiconductor storage device has a sense characteristic modifying circuit for modifying the sense characteristic of a sense amplifier that amplifies the data in a memory cell and a volatilization discriminating unit that discriminates whether or not a memory cell suffers volatilization by comparing the level of a data read before modifying the sense characteristic and the level of a data read after modifying the sense characteristic. In this nonvolatile semiconductor storage device, the level of the data read on the basis of a sense characteristic with a more strict criterion is compared with the level of the data read on the basis of another sense characteristic with a less strict criterion, and it is discriminated whether or not the memory cell suffers volatilization on the basis of the result of the comparison.

REFERENCES:
patent: 4799195 (1989-01-01), Iwahashi
patent: 4811294 (1989-03-01), Kobayashi
patent: 5293333 (1994-03-01), Hashimoto
patent: 5305273 (1994-04-01), Jinbo

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