Memory block erasing in a flash memory device

Details Memory block erasing in a flash memory device Memory block erasing in a flash memory device

2007-08-28

2007-08-28

Dinh, Son (Department: 2824)

Static information storage and retrieval

Floating gate

Particular biasing

C365S185220, C365S185330

Reexamination Certificate

active

11340093

ABSTRACT:
The flash memory cell erase operation performs an erase operation at a first erase voltage for a first erase time. An erase verify read operation is then performed for an increasing sensing time period until either all of the memory cells of the block have a threshold voltage that is equal to or greater than an erased threshold voltage or a predetermined quantity of erase verify operations have been performed. The sensing time period for each subsequent verify operation is increased until a maximum sense time is reached. When the memory cells have all been erased, the erase voltage and erase time corresponding to the sensing time period at which the cells passed is used for further erase operations on the memory block.

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