SEMICONDUCTOR STORAGE DEVICE AND ITS DRIVING METHOD

Japanese Patent JP2009004010

A

To provide a semiconductor storage device which reduces the power consumption of refreshing during a data retention period.

The semiconductor storage device comprises memory cells MC for storing logical data depending on the number of majority carriers in a floating body, a plurality of bit lines BL connected to a plurality of the memory cells, a plurality of word lines WL connected to the plurality of memory cells, sense amplifiers S/A for reading data from the memory cells and writing data into the memory cells, a refresh controller REFC for directing refresh operation by temporarily reading the data from the memory cell to write back the logical data the same as the data into the same memory cell, and refresh timers Tmr1 and Tmr2 which have a refresh interval between successive refresh operations as a first interval for a data reading mode or a data writing mode, and the refresh interval longer than the first interval as a second interval for a data retention mode, respectively.

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OSAWA TAKASHI

JP2007162529A

January 08, 2009

June 20, 2007

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TOSHIBA CORP

G11C11/406; G11C11/404

JP2008234779A	2008-10-02
JP2006073062A	2006-03-16
JP2002133861A	2002-05-10
JP2005302077A	2005-10-27
JPH02123592A	1990-05-11
JP2006146992A	2006-06-08

WO2002082454A1

2002-10-17

Kenji Yoshitake
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Akaoka Akira

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