Semiconductor memory device and method thereof

Details Semiconductor memory device and method thereof Semiconductor memory device and method thereof

1996-11-15

1998-05-12

Nguyen, Tan T.

Static information storage and retrieval

Systems using particular element

Flip-flop

365154, 257903, 257904, G11C 1140

Patent

active

057516405

ABSTRACT:
A semiconductor memory device and a fabrication method thereof include formation of surplus gates connected to a cell node of a gate edge region, located at a cell node side of a SRAM access transistor, and to the gate of a driving transistor located at the opposite side thereof. The present invention prevents silicon loss of the substrate caused by the formation of a buried contact in the conventional device, secures an operational stability of the memory cell by controlling differently the current flow of an access transistor in accordance with the condition of the cell node (for example, low level or high level), and facilitates an interconnection in the cell since the gate of a side transistor is used as a substitute for another interconnection (for example, a wiring) when realizing a SRAM. Further, during a reading operation, since the resistance of the n+ source region of the cell node of the access transistor is larger than that of the drain region connected to the bit line, the current driving ability is made lower, and the operational stability is enhanced.

REFERENCES:
patent: 4852060 (1989-07-01), Rockett, Jr.
patent: 5070032 (1991-12-01), Yuan et al.
patent: 5153852 (1992-10-01), Terrell
patent: 5220182 (1993-06-01), Matsuoka et al.
patent: 5386379 (1995-01-01), Ali-Yamia et al.
patent: 5621232 (1997-04-01), Ohno

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