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. An integrated circuit comprising:
a semiconductor memory array comprising:
a plurality of memory cells arranged in a matrix of rows and columns, wherein at least two of said memory cells each include:
a transistor comprising a source region, a first floating body region, a drain region, and a gate; and
a silicon controlled rectifier device having a cathode region, a second floating body region, a buried layer region, and an anode region;
a non-volatile memory comprising a resistance change element configured to store data stored in said first floating body region upon transfer thereto; and
a control circuit configured to perform said transfer;
wherein a state of said memory cell is stored in said first floating body region when power is applied to said cell;
wherein said first floating body region and said second floating body region are common;
wherein said silicon controlled rectifier device maintains a state of said memory cell;
wherein said transistor is usable to access said memory cell; and
wherein said transfer is performable to said at least two of said memory cells in parallel.
2. The integrated circuit of claim 1 , wherein said resistance change element comprises a phase change material.
3. The integrated circuit of claim 1 , wherein said resistance change element comprises a metal-oxide-metal system.
4. The integrated circuit of claim 1 , wherein said non-volatile memory is configured to store said data stored in said floating body upon receiving an instruction to back up said data stored in said floating body.
5. The integrated circuit of claim 1 , wherein said non-volatile memory is configured to store said data stored in said first floating body region upon a loss of power to said array, wherein said array is configured to perform a shadowing process wherein said data in said first floating body region is loaded into and stored in said non-volatile memory.
6. The integrated circuit of claim 5 , wherein said loss of power to said array is one of unintentional power loss or intentional power loss, wherein said intentional power loss is predetermined to conserve power.
7. The integrated circuit of claim 5 , wherein, upon restoration of power to said array, said data in said non-volatile memory is loaded into said first floating body region and stored therein.
8. The integrated circuit of claim 7 , wherein said array is configured to reset said non-volatile memory to an initial state after loading said data into said first floating body region upon said restoration of power.
9. An integrated circuit comprising:
a semiconductor memory array comprising:
a plurality of memory cells arranged in a matrix of rows and columns, wherein at least two of said memory cells each include:
a transistor comprising a source region, a first floating body region, a drain region, and a gate, and
a silicon controlled rectifier device having a cathode region, a second floating body region, a buried layer region, and an anode region;
a nonvolatile memory comprising a resistance change element configured to store data stored in said first floating body region upon transfer thereto;
a first control circuit configured to provide electrical signals to said transistor to access said memory cell; and
a second control circuit configured to perform said transfer;
wherein a state of said memory cell is stored in said first floating body region when power is applied to said cell;
wherein said first floating body region and said second floating body region are common;
wherein said silicon controlled rectifier device maintains a state of said memory cell;
wherein said transistor is usable to access said memory cell;
wherein said anode region is commonly connected to at least two of said memory cells; and
wherein said transfer is performable to said at least two of said memory cells in parallel.
10. The integrated circuit of claim 9 , wherein said resistance change element comprises a phase change material.
11. The integrated circuit of claim 9 , wherein said resistance change element comprises a metal-oxide-metal system.
12. The integrated circuit of claim 9 , wherein said non-volatile memory is configured to store 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.
13. The integrated circuit of claim 9 , wherein said non-volatile memory is configured to store 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 non-volatile memory.
14. The integrated circuit of claim 13 , wherein said loss of power to said cell is one of unintentional power loss or intentional power loss, wherein said intentional power loss is predetermined to conserve power.
15. The integrated circuit of claim 13 , wherein, upon restoration of power to said cell, said data in said non-volatile memory is loaded into said silicon controlled rectifier device and stored therein.
16. The integrated circuit of claim 15 , wherein said cell is configured to reset said non-volatile memory to an initial state after loading said data into said silicon controlled rectifier device upon said restoration of power.
17. The integrated circuit of claim 9 , wherein said silicon controlled rectifier device is formed in a fin.
18. The integrated circuit of claim 9 , wherein said data stored in said silicon controlled rectifier device determines a current flowing to said non-volatile memory.