Nonvolatile semiconductor static random access memory device

1. A nonvolatile semiconductor memory device including a plurality of data registers,

wherein each of the plurality of data registers comprises:

a storage node;

a pull-up driving unit adapted and configured to pull up the storage node and having a latch structure where its control terminal is cross-coupled with the storage node;

a pull-down driving unit adapted and configured to pull down the storage node and having a latch structure where its control terminal is cross-coupled with the storage node;

a data input/output unit adapted and configured to selectively input and output data between a bit line and the storage node depending on a voltage applied to a word line; and

a data storing unit adapted and configured to store data of the storage node in a ferroelectric layer depending on a voltage applied to a top word line and a bottom word line or to output data that corresponds to resistance change of a float channel layer according to a polarization state of charges stored in the ferroelectric layer to the storage node and read the outputted data.

2. The nonvolatile semiconductor memory device according to claim 1 , wherein each of the plurality of nonvolatile memory cells comprises:

the bottom word line;

the float channel layer formed on the bottom word line;

the ferroelectric layer formed on the float channel layer, and adapted and configured to store data; and

the top word line formed on the ferroelectric layer in parallel with the bottom word line, wherein the float channel layer attains resistance state that corresponds to data stored in the storage node at a write mode and attains resistance state corresponds to data stored in the ferroelectric layer at a read mode.

3. The nonvolatile semiconductor memory device according to claim 2 , wherein the float channel layer is formed of at least one of a carbon nano tube, silicon, germanium, and an organic semiconductor.

4. The nonvolatile semiconductor memory device according to claim 2 , wherein each of the plurality of nonvolatile memory cells writes data into the ferroelectric layer depending on a level of the top word line while the bottom word line is selected.

5. The nonvolatile semiconductor memory device according to claim 2 , wherein each of the plurality of nonvolatile memory cells induces different channel resistances in the float channel layer to read corresponding data depending on a polarization state of charges stored in the ferroelectric layer.

6. The nonvolatile semiconductor memory device according to claim 2 , wherein the float channel layer attains a high resistance state to be turned off when the polarization state of charges stored in the ferroelectric layer induces positive charges into the float channel of the float channel layer.

7. The nonvolatile semiconductor memory device according to claim 2 , where in the float channel layer attains a low resistance state to be turned on when the polarization state of charges stored in the ferroelectric layer induces negative charges into the float channel of the float channel layer.

8. The nonvolatile semiconductor memory device according to claim 2 , wherein high level data are written in the ferroelectric layer when: a positive voltage is applied to the bottom word line; a negative voltage is applied to the top word line; and a ground voltage is applied to a drain region and a source region.

9. The nonvolatile semiconductor memory device according to claim 8 , wherein the polarization state of charges stored in the ferroelectric layer induces positive charges into the float channel of the float channel layer and high level data are read, when a ground voltage is applied to the bottom word line and the top word line.

10. The nonvolatile semiconductor memory device according to claim 8 , wherein a previously stored high level data in the ferroelectric layer is maintained when a positive voltage is applied to the bottom word line and the top word line, a positive voltage is applied to a drain region and a source region.

11. The nonvolatile semiconductor memory device according to claim 2 , wherein low level data are written in the ferroelectric layer when a positive voltage is applied to the bottom word line and the top word line and a ground voltage is applied to a drain region and a source region.

12. The nonvolatile semiconductor memory device according to claim 11 , wherein the polarization state of charges stores in the ferroelectric layer induces negative charges into the float channel of the float channel layer and low level data are read, when a ground voltage is applied to the bottom word line and the top word line.

13. The nonvolatile semiconductor memory device according to claim 1 , wherein the pull-up driving unit comprises a plurality of PMOS transistors each configured to have a gate cross-coupled to the stores node with a latch type circuit.

14. The nonvolatile semiconductor memory device according to claim 1 , wherein the pull-down driving unit comprises a plurality of NMOS transistors each configured to have a gate cross-coupled to the storage node with a latch type circuit.

15. The nonvolatile semiconductor memory device according to claim 1 , wherein each of the data input/output units comprises a plurality of switch units each adapted and configured to selectively input and output data between the bit line and the storage node of a corresponding one of the plurality of data registers depending on a voltage applied to the word line.

16. The nonvolatile semiconductor memory device according to claim 15 , wherein the switch unit is a NMOS transistor configured to have a gate connected to the word line.

17. The nonvolatile semiconductor memory device according to claim 1 , wherein the data stored in the data storing unit of the data register are restored by a program state of the pull-up driving unit at a power-on mode.