Flash memory device capable of preventing program disturbance according to partial programming
View Patent ↗A non-volatile semiconductor memory device disclosed herein includes arrays of memory cells arranged along rows and columns. The columns are divided into at least two column regions and each row is divided into two electrically isolated word lines that are arranged in the column regions. The memory device further includes a determining circuit for judging which column region a data loaded on a register belongs to during a program operation, and a selecting circuit for choosing one of the rows in response to the row address information and driving one or all of the word lines in the selected row with a program voltage according to the judging.
1. A non volatile semiconductor memory device, comprising:
arrays of memory cells arranged along rows and columns, wherein the columns are divided into at least two column regions;
a register for latching data to be programmed in the array;
a gate circuit for transmitting data to be programmed to the register in response to column address information;
a determining device for judging which column region the data loaded on the register belongs to, during a program operation; and
a selecting device for choosing one of the rows in response to row address information, and for driving one or word lines in the selected row to a program voltage according to a result of judging:
wherein each of the columns is divided into at least two electrically isolated word lines each arranged in the column regions.
2. The device of claim 1 , wherein the determining device judges which column region the data loaded on the register belongs to according to the column address information.
3. The device of claim 1 , wherein when all of the data loaded on the register belongs to one of the column regions, the selecting device drives the all of the word lines in the selected column with the program voltage.
4. The device of claim 1 , wherein when the data loaded on the register belongs to any one of the column regions, the selecting device drives one of the word lines in the selected row with the program voltage, and the word line supplied with the program voltage corresponds to the column region with the loaded data.
5. The device of claim 1 , wherein the selecting device drives all of the word lines in the selected row with a ground voltage regardless of the judging by the determining device during a read operation.
6. The device of claim 1 , wherein the selecting drives all of the word lines in the selected row with a ground voltage regardless of the judging by the determining device during an erase operation.
7. The device of claim 1 , wherein the selecting device comprises:
a first selecting circuit for driving one of the word lines in the selected row with the program voltage, wherein the word line driven with the program voltage belongs to one of the column regions; and
a second selecting circuit for driving one of the word lines in the selected row with the program voltage, wherein the word line driven with the program voltage belongs to the other one of the column regions.
8. The device of claim 7 , wherein the determining device, comprises:
a detecting circuit for detecting a column region which the data the register belongs to in response to a column address for selecting the column regions and generating selection signals as a result of detecting; and
a switching circuit for selectively transmitting the program voltage to the first and second selecting circuits in response to the selection signals.
9. The device of claim 1 , wherein a pass voltage is applied to word lines of non-selected rows in the column region including the word lines of the selected word lines provided with the program voltage.
10. A flash memory device, comprising:
an array divided into a first memory block and a second memory block;
at least two word lines coupled to each memory block;
a first row decoder circuit for selecting one of the word lines of the first memory block and driving the selected word line with a program voltage and the non-selected word lines with a pass voltage;
a second row decoder circuit for selecting one of the word lines the of second memory block and driving the selected word lines with a program voltage and the non-selected word lines with a pass voltage;
a page buffer circuit for latching data to be programmed to the array;
a gate circuit for transmitting the data to be programmed to the page buffer circuit in response to a column address;
a determining circuit for judging to which memory block the data loaded on the page buffer circuit is programmed in response to the column address selecting at least one of the first and second memory blocks and generating selection signals as a result of judging; and
a driving signal generator circuit for outputting driving signals each to be provided for corresponding word lines of the first and second memory blocks; and
a switching circuit for switching the driving signals with all or one of the first and second decoder circuits in response to the selection signals from the determining circuit;
wherein the first and second memory blocks each include a plurality of NAND strings, and each of the NAND strings includes memory cells connected to the corresponding word lines, respectively; and
wherein the one of the driving signals has the program voltage and the rest driving signals have the pass voltage during a program operation.
11. The device of claim 10 , wherein the determining circuit comprises:
a first flip-flop and a second flip-flop each reset by a reset signal;
a first set circuit for setting the first flip-flop in response to an address signal input for indicating the first memory block during the program operation;
a first high voltage switch for receiving an output signal of the first flip-flop to generate a first selection signal from the selection signals, wherein the first selection signal has a high voltage during an activation;
a second set circuit for setting the second flip-flop in response to an address signal for indicating the second memory block during the program operation; and
a second high voltage switch for receiving an output signal of the second flip-flop to generate a second selection signal of the selection signals, so that the second selection signal has a high voltage during an activation.
12. The device of claim 11 , wherein the reset signal is activated when an input command of a sequential data is introduced.
13. The device of claim 11 , wherein the switching circuit includes switches operating in response to the first and second selection signals and each corresponding to the driving signals, and
wherein each of the switches includes a first depletion MOS transistor for transmitting a corresponding driving signal to the first row decoder circuit in response to the first selection signal, and a second depletion MOS transistor for transmitting a corresponding driving signal to the second row decoder circuit in response to the second selection signal.
14. The device of claim 11 , wherein the array further includes a spare field memory region,
wherein the spare field memory region is divided into spare memory blocks each corresponding to the first and second memory blocks, and
wherein each of the spare memory blocks is disposed with the corresponding memory block.
15. The device of claim 14 , wherein the memory block and the spare memory block disposed in the same region are controlled by an identical row decoder circuit.
16. A flash memory device, comprising:
an array divided into a plurality of memory blocks;
at least two word lines coupled to each memory block;
a plurality of row decoder circuits each corresponding to the memory blocks and for selecting one of the word lines in the corresponding memory blocks and driving the selected word line with a program voltage and the non-selected word lines with a pass voltage;
a page buffer circuit for latching data being programmed in the array;
a gate circuit for transmitting the data to be programmed to the page buffer circuit in response to a column address;
a determining circuit for judging to which memory block the data loaded on the page buffer circuit is programmed in response to the column address selecting a least one of the memory blocks and generating selection signals as a result of the judging;
a driving signal generator circuit for generating at least two driving signals, each driving signal being provided to corresponding word lines of each of the memory blocks, respectively, wherein one of the driving signals has the program voltage and the rest of the driving signals have the pass voltage during a program operation; and
a switching circuit for selectively switching the driving signals to the row decoder circuits in response to the selection signals from the determining circuit, wherein one of more of the driving signals is transmitted to one or more row decoder circuits where the data loaded on the page buffer circuit is programmed,
wherein the memory blocks each include a plurality of NAND strings, and each of the NAND strings includes memory cells each connected to a corresponding word line.
17. The device of claim 16 , wherein the array further includes a spare field memory region,
wherein the spare field memory region is divided into spare memory blocks each corresponding to one of the memory blocks, and
wherein each of the spare memory blocks is disposed with the corresponding memory block.
18. The device of claim 17 , wherein the memory block and the spare memory block disposed in the same region are controlled by an identical row decoder circuit.