Flash memory array with self-limiting erase

Details Flash memory array with self-limiting erase Flash memory array with self-limiting erase

1995-05-05

1997-04-29

Nguyen, Viet Q.

Static information storage and retrieval

Read/write circuit

Erase

36518533, 3651853, 36518529, G11C 1602

Patent

active

056256000

ABSTRACT:
A flash memory array with self-limiting erase for preventing over-erasure utilizes a self-limiting-rase floating gate transistor coupled to the memory array or to each row of memory cells. The self-limiting-erase transistor has a smaller threshold voltage than the memory cells. When all memory cells or one row of memory cells are erased, the drain of the transistor is connected via a feedback path to all word lines of the memory array or to the corresponding word line for that row of memory cells. When the self-limiting-erase transistor is turned on due to full erasing, the potential of the word lines is pulled up to the erasing voltage which is applied at the sources of the memory cells, thereby the erase operation is stopped automatically.

REFERENCES:
patent: 4797856 (1989-01-01), Lee et al.
patent: 5220528 (1993-06-01), Mielke
patent: 5241507 (1993-08-01), Fong
patent: 5357466 (1994-10-01), Hong
patent: 5428578 (1995-06-01), Kaya et al.

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