05-09-2013 дата публикации
Номер: US20130229887A1
In a static random access memory (SRAM) device having a hierarchical bit line architecture, a local sense amplifier (SA) circuit includes P-channel transistors which precharge local bit lines connected to memory cells, P-channel transistors each having a gate connected to a corresponding one of the local bit lines and a drain connected to a corresponding one of global bit lines, and N-channel transistors each having a gate connected to a corresponding one of the global bit lines and a drain connected to a corresponding one of the local bit lines. As a result, restore operation to a non-selected memory cell during write operation can be achieved without the need of a fine timing control, the speed of read operation by a feedback function can be increased, and the area can be reduced. 2. The semiconductor memory device of claim 1 , whereinthe first and second signal lines are local bit lines,the third and fourth signal lines are global bit lines,the local and global bit lines form a hierarchical bit line architecture.3. The semiconductor memory device of claim 1 , wherein a first cell transistor of the first conductivity type having a source connected to the first power supply potential, a drain connected to a first memory node, and a gate connected to a second memory node,', 'a second cell transistor of the first conductivity type having a source connected to the first power supply potential, a drain connected to the second memory node, and a gate connected to the first memory node,', 'a third cell transistor of the second conductivity type having a source connected to the second power supply potential, a drain connected to the first memory node, and a gate connected to the second memory node,', 'a fourth cell transistor of the second conductivity type having a source connected to the second power supply potential, a drain connected to the second memory node, and a gate connected to the first memory node,', 'a fifth cell transistor of the second conductivity type ...
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