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US 2011/0085372 A1Published application
Non-volatile sram cell that incorporates phase-change memory into a cmos process
AssigneeMicron Technology, Inc.
InventorRichard Fackenthal
Life of this patent
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Abstract
A SRAM cell having two cross-coupled inverters formed by CMOS technology and first and second chalcogenic elements integrated with the SRAM cell to add nonvolatile properties to the storage cell. The PCM resistors are programmed to the SET state and the RESET state, and upon power-up the SRAM cell takes on the data contained in the PCM cells.
Claims20
A storage cell, comprising:
- a Static Random Access Memory (SRAM) cell having two pass transistors and four logic transistors connected in two cross-coupled inverters, the SRAM cell formed by Complementary Metal-Oxide Semiconductor (CMOS) technology;
- and
- a Phase-Change Memory (PCM) portion layered onto the SRAM cell to provide the SRAM cell with nonvolatility.
A storage cell, comprising:
- first and second pass gate transistors in a Static Random Access Memory (SRAM) cell that are coupled to bitlines to program two cross-coupled inverters;
- and
- third and fourth pass gate transistors coupled to the bitlines to program a first Phase-Change Memory (PCM) element to a SET state and a second PCM element to a RESET state where the two cross-coupled inverters take on the data of the first and second PCM elements.
A storage cell, comprising:
- first and second pass gate transistors in a Static Random Access Memory (SRAM) cell that are coupled to bitlines to program two cross-coupled inverters;
- and
- first and second conductors to respectively program a first Phase-Change Memory (PCM) element to a SET state and a second PCM element to a RESET state where the two cross-coupled inverters take on the data of the PCM elements.
A storage cell, comprising:
- Complementary Metal-Oxide Semiconductor (CMOS) logic to form a volatile memory element;
- and
- Phase-Change Memory (PCM) added to the CMOS logic to impart non-volatile characteristics to the storage cell.
Dependencies are inferred from the claim text.