Invention Grant
- Patent Title: Semiconductor memory device
- Patent Title (中): 半导体存储器件
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Application No.: US12635552Application Date: 2009-12-10
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Publication No.: US08077493B2Publication Date: 2011-12-13
- Inventor: Akira Katayama
- Applicant: Akira Katayama
- Applicant Address: JP Tokyo
- Assignee: Kabushiki Kaisha Toshiba
- Current Assignee: Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Tokyo
- Agency: Knobbe, Martens, Olson & Bear LLP
- Priority: JP2008-313920 20081210
- Main IPC: G11C5/06
- IPC: G11C5/06 ; G11C8/08 ; G11C7/00

Abstract:
A semiconductor memory device includes a memory cell array disposing a plurality of memory cells at each intersection of word lines and bit lines, the memory cell including one pair of cross-connected inverters including a transistor, a first dummy transistor having a threshold voltage which has a certain relationship with a threshold voltage of the transistor of the memory cell, a dummy bit line connected to one end of the first dummy transistor, and the dummy bit line charged so as to have a predetermined voltage, a dummy transistor control circuit configured to control conduction of the first dummy transistor, and a word line driver configured to supply a word line voltage to the word line connected to the selected memory cell, and the word line driver configured to change a rise time of the word line voltage in accordance with a change in a voltage of the dummy bit line.
Public/Granted literature
- US20100142253A1 SEMICONDUCTOR MEMORY DEVICE Public/Granted day:2010-06-10
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