Semiconductor memory device

Static information storage and retrieval – Read/write circuit – Differential sensing

Reexamination Certificate

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Details

C365S189040, C365S185210, C365S230060, C365S196000, C365S189150

Reexamination Certificate

active

07978552

ABSTRACT:
A memory includes memory cells, wherein during a first write operation in which first logical data is written in all memory cells connected to a first word line, a source line driver and a word line driver, the source line driver shifts a voltage of a selected source line corresponding to the first word line in a direction away from the voltage of the first word line and the word line driver shifts a voltage of a second word line in a same direction as a transition direction of voltage of a selected source line, and during a second write operation in which second logical data is written in a selected cell connected to the first word line, the source line driver and the word line driver shift voltages of the selected source line and the second word line in a direction approaching the voltage of the first word line.

REFERENCES:
patent: 6621725 (2003-09-01), Ohsawa
patent: 7539043 (2009-05-01), Ohsawa
patent: 2009/0273976 (2009-11-01), Maejima et al.
patent: 2006-301377 (2006-11-01), None

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