This brief describes a charge redistribution transient cell supply voltage collapse write assist (CR-TVC-WA) for static random access memory. Although wordline underdrive read assist is a requisite for stable read operations in deep submicrometer technologies, it significantly degrades the write ability. To overcome this problem, a transient cell supply voltage (V_DD,CELL) collapse write assist (TVC-WA) method is widely used, but it consumes a large amount of energy. In the proposed CR-TVC-WA, the virtual cell supply and ground nodes are temporarily floated and connected to each other during the write operation. This improves the write ability and significantly reduces energy consumption. Simulation results indicate that the minimum operation voltage (V_MIN) is approximately 660 mV when the write operation is performed at 1 GHz and the extra write energy consumption (3.8 fJ) additionally required to satisfy the target yield (6σ) is reduced by 46% compared with that in the conventional TVC-WA (7.0 fJ).

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deep submicrometer yield 6x03c3 operation voltage vsubminsub static random access memory charge redistribution transient cell supply voltage collapse write assist crtvcwa write ability virtual cell supply energy tvcwa 70 ground nodes underdrive read assist stable read operations

Juhyun Park, Hanwool Jeong, Seong-Ook Jung,Kiryong Kim,.Transient Cell Supply Voltage Collapse Write Assist Using Charge Redistribution. 63 (10),964-968.

Juhyun Park, et al."Transient Cell Supply Voltage Collapse Write Assist Using Charge Redistribution" 63

Juhyun Park, Hanwool Jeong, Seong-Ook Jung,Kiryong Kim,"Transient Cell Supply Voltage Collapse Write Assist Using Charge Redistribution"