Memory cells, memory cell arrays, methods of using and methods of making
A semiconductor memory cell and arrays of memory cells are provided In at least one embodiment, a memory cell includes a substrate having a top surface, the substrate having a first conductivity type selected from a p-type conductivity type and an n-type conductivity type; a first region having a second conductivity type selected from the p-type and n-type conductivity types, the second conductivity type being different from the first conductivity type, the first region being formed in the substrate and exposed at the top surface; a second region having the second conductivity type, the second region being formed in the substrate, spaced apart from the first region and exposed at the top surface; a buried layer in the substrate below the first and second regions, spaced apart from the first and second regions and having the second conductivity type; a body region formed between the first and second regions and the buried layer, the body region having the first conductivity type; a gate positioned between the first and second regions and above the top surface; and a nonvolatile memory configured to store data upon transfer from the body region.
1. A semiconductor memory cell comprising:
a silicon controlled rectifier device configured to store data when power is applied to said cell; and
a nonvolatile memory comprising a resistance change element configured to store data stored in said silicon controlled rectifier device upon transfer thereto.
2. The semiconductor memory cell of claim 1 , wherein said resistance change element comprises a phase change material.
3. The semiconductor memory cell of claim 1 , wherein said resistance change element comprises a metal-oxide-metal system.
4. The semiconductor memory cell of claim 1 , wherein said silicon controlled rectifier device comprises a floating body region configured to store a state of said silicon controlled rectifier device.
5. The semiconductor memory cell of claim 1 , further comprising:
a buried layer region in electrical contact with said floating body region, located below said floating body region.
6. The semiconductor memory cell of claim 1 , wherein said nonvolatile memory stores said data stored in said silicon controlled rectifier device upon receiving an instruction to back up said data stored in said silicon controlled rectifier device.
7. The semiconductor memory cell of claim 1 , wherein said nonvolatile memory stores said data stored in said silicon controlled rectifier device upon a loss of power to said cell, wherein said cell is configured to perform a shadowing process wherein said data in said silicon controlled rectifier device is loaded into and stored in said nonvolatile memory.
8. The semiconductor memory cell of claim 7 , wherein said loss of power to said cell is one of unintentional power loss or intentional power loss, wherein intentional power loss is predetermined to conserve power.
9. The semiconductor memory cell of claim 7 , wherein, upon restoration of power to said cell, said data in said nonvolatile memory is loaded into said silicon controlled rectifier device and stored therein.
10. The semiconductor memory cell of claim 9 , wherein said cell is configured to reset said nonvolatile memory to an initial state after loading said data into said silicon controlled rectifier device upon said restoration of power.
11. The semiconductor memory cell of claim 1 , wherein said silicon controlled rectifier device is formed in a fin.
12. The semiconductor memory cell of claim 1 , wherein said data stored in said silicon controlled rectifier device determines a current flowing to said nonvolatile memory.