WO2014080616A1 - 不揮発性半導体記憶装置 - Google Patents
不揮発性半導体記憶装置 Download PDFInfo
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- WO2014080616A1 WO2014080616A1 PCT/JP2013/006785 JP2013006785W WO2014080616A1 WO 2014080616 A1 WO2014080616 A1 WO 2014080616A1 JP 2013006785 W JP2013006785 W JP 2013006785W WO 2014080616 A1 WO2014080616 A1 WO 2014080616A1
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Definitions
- the present invention relates to a nonvolatile semiconductor memory device, and more particularly, to a technique for improving basic characteristics of a memory and speeding up reading and writing of data.
- the main non-volatile memory is a flash memory, but the rewrite time of the flash memory is on the order of microseconds or milliseconds, which hinders the improvement of the performance of a set device equipped with the flash memory.
- Nonvolatile memories that can be rewritten at high speed and with low power consumption compared to flash memories have been actively developed.
- a resistance change type memory Resistive Random Access Memory
- the rewriting time can be rewritten at a high speed of nanosecond order.
- the voltage required for rewriting requires 10 V or more in the flash memory, but about 1.8 V in the resistance change type memory, so that low power consumption of the nonvolatile memory can be realized.
- Patent Document 1 discloses a configuration of a read circuit of a resistance change type memory.
- the memory cell of the resistance change type memory is constituted by a series connection of a resistance change element and a cell transistor.
- the variable resistance element stores data by being set to a low resistance value or a high resistance value within a resistance value range of 1 K ⁇ to 1 M ⁇ , for example, in accordance with stored data (“0” data, “1” data).
- the resistance value of the variable resistance element is low, the memory cell current is large, and when the resistance value is high, the memory cell current is small. The data stored in the cell is read out.
- Patent Document 2 discloses a configuration of a write circuit of a resistance change type memory.
- the memory cell of the resistance change type memory is constituted by a series connection of a resistance change element and a cell transistor.
- the resistance change element can have a high resistance or a low resistance depending on the direction of the write voltage. For example, it is possible to increase the resistance of the memory cell by applying a write voltage to the resistance change element side of the memory cell and grounding the cell transistor side, and grounding the resistance change element side of the memory cell and writing to the cell transistor side By applying a voltage, the resistance can be reduced.
- the above-described conventional variable resistance nonvolatile memory has the following problems. That is, since the bit line is commonly connected to the resistance change element of the memory cell, it is necessary to wire in the upper layer of the resistance change element, and generally the wiring resistance is reduced, but the parasitic capacitance load is increased. However, since the source line is commonly connected to the cell transistors of the memory cell, it is necessary to wire below the bit line, and generally the wiring resistance increases and the parasitic capacitance load decreases. Therefore, at the time of data writing, a write voltage (Vreset) is applied to the bit line when increasing the resistance of the variable resistance element, and a write voltage (Vset) is applied to the source line when decreasing the resistance.
- Vreset write voltage
- Vset write voltage
- the write voltage is applied, since the resistance load of the bit line and the source line is different, the applied voltage is different at both ends of the memory cell. As a result, the basic characteristics of the nonvolatile memory, such as the rewrite frequency characteristic and the data retention characteristic after rewriting, may be deteriorated. Further, it is necessary to charge the bit line when reading data or writing data. However, since the bit line has a large capacitive load, it cannot be charged at high speed.
- an object of the present invention is to improve the basic characteristics of a memory and speed up data reading and writing in a nonvolatile semiconductor memory device.
- the nonvolatile semiconductor memory device includes a first memory including at least a first cell transistor and a first variable resistance element having one end connected to the drain end of the first cell transistor as a plurality of memory cells.
- a second memory cell including a cell, a second cell transistor, and a second variable resistance element having one end connected to the drain end of the second cell transistor, and the plurality of memory cells
- a plurality of word lines provided in correspondence with each other, a first word line connected to the gate terminal of the first cell transistor and a second word connected to the gate terminal of the second cell transistor.
- a first data line connecting the source end of the first cell transistor and the other end of the second variable resistance element, the other end of the first variable resistance element, and the first 2 And a second data line for connecting the source terminal of the cell transistor.
- the nonvolatile semiconductor memory device includes a plurality of memory cells arranged in a matrix and each including a cell transistor and a resistance change element connected to a drain end of the cell transistor, and each row of the plurality of memory cells.
- a plurality of word lines connected in common to the gate ends of the cell transistors included in the corresponding memory cell, and each column or each row of the plurality of memory cells.
- a plurality of first data lines connected in common to the resistance change elements included in the corresponding memory cell, and each column or each row of the plurality of memory cells are provided corresponding to each other and included in the corresponding memory cell.
- a plurality of second data lines commonly connected to the source ends of the cell transistors, and at least one of the plurality of word lines A first memory cell array region including a plurality of word lines and a second memory cell array region including at least one word line different from the word lines included in the first memory cell array region,
- the plurality of first data lines in the memory cell array region and the plurality of second data lines in the second memory cell array region are connected to each other, and the plurality of data lines in the first memory cell array region are connected to each other.
- the second data line and the plurality of first data lines in the second memory cell array region are connected to each other.
- the nonvolatile semiconductor memory device includes a plurality of memory cells arranged in a matrix and each including a cell transistor and a resistance change element connected to a drain end of the cell transistor, and each row of the plurality of memory cells.
- a plurality of word lines connected in common to the gate ends of the cell transistors included in the corresponding memory cell, and each column or each row of the plurality of memory cells.
- a plurality of first data lines connected in common to the resistance change elements included in the corresponding memory cell, and each column or each row of the plurality of memory cells are provided corresponding to each other and included in the corresponding memory cell.
- a plurality of second data lines commonly connected to the source ends of the cell transistors, and at least one of the plurality of word lines A first memory cell array region including a plurality of word lines and a second memory cell array region including at least one word line different from the word lines included in the first memory cell array region, At least one pair of the first and second data lines among the plurality of first and second data lines in the memory cell array region is the plurality of first and second data in the second memory cell array region. Are connected to at least one pair of first and second data lines, and at least one pair of first data lines among the plurality of first and second data lines remaining in the first memory cell array region. And the second data line includes at least one pair of second and second data lines among the plurality of remaining first and second data lines in the second memory cell array region. Beauty and is connected to the first data line.
- the resistance change element when the resistance change element is increased in resistance when data is written to the memory cell, a write voltage is applied to the first data line and the second data line is grounded.
- the first data line is grounded, and a write voltage is applied to the second data line.
- the wiring resistance load of the second data line is larger than that of the first data line, and the voltage drop amounts of these data lines are different from each other, and therefore the same for each of the first and second data lines.
- the same write voltage is not applied to both ends of the memory cell.
- the drain voltage Vset for example, 2.4 V
- the drain voltage Vreset when the resistance change element is lowered has a voltage drop of 300 mV at the end of the memory array
- the drain voltage Vreset when the resistance is increased
- 2.4V has a voltage drop of 60 mV at the end of the memory array. Therefore, the voltage balance is lost between the case where the resistance change element has a high resistance and the case where the resistance change element has a low resistance.
- the number of times of rewriting increases, the data retention characteristics after rewriting deteriorate.
- the load on the first and second data lines can be equalized.
- the voltage applied to both ends of the memory cell is also the same.
- the drain voltage Vset for example, 2.4 V
- the drain voltage Vreset when the resistance is increased
- 2.4V has a voltage drop of 180 mV at the end of the memory array. Therefore, the voltage balance is improved between the case where the resistance is increased and the case where the resistance is decreased, and the basic characteristics of the nonvolatile memory such as the rewrite frequency characteristic and the data retention characteristic after the rewrite are improved.
- charging is performed from the first data line connected to the variable resistance element included in the memory cell, and the second data line connected to the source terminal of the cell transistor is connected to the ground voltage.
- the data stored in the memory cell is determined by the sense amplifier.
- the capacitive loads of the first data line and the second data line can be equalized, the capacitive load of the first data line and via is reduced. It can be substantially halved. As a result, the first data line can be charged at high speed.
- the present invention is more effective in the nonvolatile semiconductor memory device in which the memory capacity tends to increase. is there.
- the capacitive loads of the first and second data lines can be made uniform, the basic characteristics of the memory are improved and the reading and writing of data are speeded up. be able to.
- FIG. 1 is a configuration diagram of a memory array that is a main part of a nonvolatile semiconductor memory device according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a minimum unit configuration of the memory array of FIG.
- FIG. 3 is a diagram illustrating an overall configuration of the nonvolatile semiconductor memory device according to the embodiment.
- FIG. 4 is a diagram showing a configuration example of a memory cell included in the memory array of FIG.
- FIG. 5 is a cross-sectional view of the memory cell shown in FIG.
- FIG. 6 is a diagram illustrating a relationship between each operation mode of the nonvolatile semiconductor memory device according to the embodiment and a voltage applied to the memory cell.
- FIG. 1 is a configuration diagram of a memory array that is a main part of a nonvolatile semiconductor memory device according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a minimum unit configuration of the memory array of FIG.
- FIG. 3 is a diagram illustrating an overall configuration of
- FIG. 7 is a diagram illustrating an example of a selected memory cell during a read operation of the nonvolatile semiconductor memory device according to the embodiment.
- FIG. 8 is an operation waveform diagram at the time of a read operation of the nonvolatile semiconductor memory device according to the first embodiment.
- FIG. 9 is a diagram illustrating an example of a selected memory cell during a write operation of the nonvolatile semiconductor memory device according to the embodiment.
- FIG. 10 is an operation waveform diagram during the write operation of the nonvolatile semiconductor memory device according to the embodiment.
- FIG. 11 is a diagram showing another configuration example of the memory array of FIG.
- FIG. 12 is a diagram showing still another configuration example of the memory array of FIG.
- FIG. 1 is a diagram showing a detailed configuration of a memory array that is a main part of a nonvolatile semiconductor memory device according to an embodiment of the present invention, and is a diagram showing a data line connection method that is a feature of the present invention. .
- FIG. 2 is a diagram showing the configuration of the minimum unit of the memory array of FIG. 1 and 2 will be described in detail after the entire configuration of the nonvolatile semiconductor memory device according to this embodiment is described.
- FIG. 3 is a diagram showing an overall configuration of the nonvolatile semiconductor memory device according to the present embodiment.
- the nonvolatile semiconductor memory device includes a memory array 10, a word line driver 20, a column gate 21, a bit switch 22, a sense amplifier 23, a write driver 24, and a control circuit 25.
- a plurality of memory cells for storing data are arranged inside the memory array 10.
- word lines WL0_0 to WL0_n, WL1_0 to WL1_n (appropriately abbreviated as WL) and bit lines BL0 to BLm (appropriately abbreviated as BL) provided corresponding to each of the plurality of memory cells.
- Source lines SL0 to SLm (abbreviated as SL as appropriate) are connected. Details of the memory array 10 will be described later.
- M and n are integers of 0 or more.
- the word line driver 20 is a circuit that selects and drives one of the word lines WL connected to the memory array 10 in response to an input address (not shown in FIG. 3).
- the column gate 21 receives an input address (not shown in FIG. 3), selects one of the bit lines BL and one of the source lines SL connected to the memory array 10, and selects a bit switch 22 is a circuit connected to 22.
- the bit switch 22 receives an input address (not shown in FIG. 3), and connects either the bit line BL or the source line SL selected by the column gate 21 to a sense amplifier 23 and a write driver 24 described later. And the other is connected to the ground voltage VSS.
- the sense amplifier 23 is a circuit that determines the data stored in the memory cells of the memory array 10 during a read operation.
- the read operation is performed by selecting the bit lines BL0 to BLn to which the memory cells are connected through the column gate 21 and the bit switch 22 and connecting them to the sense amplifier 23.
- the reference current flowing through the sense amplifier 23 is described as an arbitrary value.
- the present invention can be applied to a case where the reference current is generated using a memory cell or a fixed resistance element. Applicable.
- the write driver 24 is a circuit that applies a rewrite voltage to the memory array 10 during a data rewrite operation. Specifically, when a data rewrite operation is performed on the memory cell, either the bit line BL or the source line SL is selected and a positive voltage is applied, and when the rewrite operation is not performed, the ground voltage VSS is applied. Circuit. The voltage supplied from the write driver 24 is applied to the selected bit line BL or source line SL via the column gate 21 and the bit switch 22.
- the control circuit 25 is a circuit that controls various operation modes such as reading and rewriting of the nonvolatile semiconductor memory device, and controls the word line driver 20, column gate 21, bit switch 22, sense amplifier 23, and write driver 24 described above.
- FIG. 4 is a circuit diagram of a memory cell included in the memory array according to the present embodiment.
- the nonvolatile semiconductor memory device is described as being configured using, for example, a resistance change memory (ReRAM).
- the memory cell MC is composed of a series connection of a resistance change element RR and a cell transistor TC.
- the word line WL is connected to the gate terminal of the cell transistor TC
- the bit line BL is connected to one end of the resistance change element RR
- the source line SL is connected to the source end of the cell transistor.
- the present invention can also be applied to memory cells connected to each other.
- the memory cell of the nonvolatile semiconductor memory device according to the present embodiment is a “1T1R” type resistance change type memory cell including one cell transistor TC and one resistance change element RR.
- FIG. 5 is a cross-sectional view of the memory cell shown in FIG. Diffusion regions 31a and 31b are formed on the semiconductor substrate 30, and the diffusion region 31a functions as the source terminal of the cell transistor TC and the diffusion region 31b functions as the drain terminal of the cell transistor.
- the region between the diffusion regions 31a and 31b acts as a channel region of the cell transistor TC, and an oxide film 32 and a gate electrode 33 (word line WL) made of polysilicon are formed on the channel region, thereby the cell transistor TC. Acts as
- the source terminal 31a of the cell transistor TC is connected to the source line SL which is the first wiring layer 35a through the via 34a.
- the drain terminal 31b of the cell transistor TC is connected to the first wiring layer 35b through the via 34b.
- the first wiring layer 35 b is connected to the second wiring layer 37 through the via 36, and the second wiring layer 37 is connected to the resistance change element RR through the via 38.
- the resistance change element RR includes a lower electrode 39, a resistance change layer 40, and an upper electrode 41.
- the resistance change element RR is connected to the bit line BL which is the third wiring layer 43 through the via 42.
- FIG. 6 is a diagram showing a relationship between each operation mode of the nonvolatile semiconductor memory device according to this embodiment and a voltage applied to the memory cell.
- the cell transistor TC in the data read operation, is selected by applying a gate voltage Vg_read (for example, 1.8 V) to the word line WL, and the drain voltage Vread (for example, 0.4 V) is applied to the bit line BL. And a ground voltage VSS (0 V) is applied to the source line SL.
- Vg_read for example, 1.8 V
- VSS ground voltage
- the sense amplifier 23 can determine the data stored in the memory cell MC by determining the difference between the current values.
- the gate voltage Vg_read (for example, 2.4V) is applied to the word line WL to select the cell transistor TC, and the drain voltage Vreset (for example, 2.4V) is applied to the bit line BL.
- the ground voltage VSS (0 V) is applied to the source line SL.
- the cell transistor TC is selected by applying a gate voltage Vg_set (for example, 2.4 V) to the word line WL, the ground voltage VSS (0 V) is applied to the bit line BL, and the source line A source voltage Vset (for example, 2.4 V) is applied to SL.
- Vg_set for example, 2.4 V
- VSS ground voltage
- Vset for example, 2.4 V
- the memory array 10 includes a memory cell array 11 and a memory cell array 12 in which the memory cells MC shown in FIG. 4 are arranged in a matrix in the row direction and the column direction, and an intersecting region 50 described later.
- the memory cell array 11 as the first memory cell array region includes word lines WL0_0 to WL0_n, bit lines BL0_0 to BL0_m as first data lines, and source lines SL0_0 to SL0_m as second data lines, as described above.
- the word line WL is connected to the gate end of the cell transistor
- the bit line BL is connected to one end of the variable resistance element
- the source line SL is connected to the source end of the cell transistor. That is, the memory cell array 11 includes (n + 1) ⁇ (m + 1) memory cells.
- the memory cell array 12 as the second memory cell array region includes word lines WL1_0 to WL1_n, bit lines BL1_0 to BL1_m as first data lines, and source lines SL1_0 to SL1_m as second data lines, as described above.
- the word line WL is connected to the gate end of the cell transistor
- the bit line BL is connected to one end of the variable resistance element
- the source line SL is connected to the source end of the cell transistor. That is, the memory cell array 12 includes (n + 1) ⁇ (m + 1) memory cells.
- the source lines SL0_ to SL_m and the source lines SL1_0 to SL1_m may be the first data lines
- the bit lines BL0_ to BL_m and the bit lines BL1_0 to BL1_m may be the second data lines.
- intersection region 50 is connected to the bit lines BL0_0 to BL0_m of the memory cell array 11 and the source lines SL1_0 to SL1_m of the memory cell array 12, respectively, and the source lines SL0_0 to SL0_m of the memory cell array 11 and the bit lines BL1_0 to SL1_m of the memory cell array 12 are connected.
- BL1_m is a region connected to each other. That is, in the intersection region 50, the bit line BL of the memory cell array 11 and the source line SL of the memory cell array 12, and the source line SL of the memory cell array 11 and the bit line BL of the memory cell array 12 are connected so as to cross.
- such a connection state is referred to as a cross connection as appropriate.
- the first memory cell MC0 is configured by series connection of one end of the first variable resistance element RR0 and the drain end of the first cell transistor TC0, and the first word line WL0 is a cell. Connected to the gate terminal of the transistor TC0.
- the second memory cell MC1 includes a series connection of one end of the second variable resistance element RR1 and the drain end of the second cell transistor TC1, and the second word line WL1 is connected to the gate terminal of the cell transistor TC1. Is done.
- the bit line BL is connected to the other end of the resistance change element RR0 and the source end of the cell transistor TC1, and the source line SL is connected to the source end of the cell transistor TC0 and the other end of the resistance change element RR1.
- FIG. 7 is a view showing an example of a selected memory cell during a read operation of the nonvolatile semiconductor memory device according to this embodiment.
- the bit switch 22 includes first to fourth switch transistors 22a to 22d.
- the first switch transistor 22a has a gate terminal connected to the bit switch line BS1, and switches connection and disconnection between the bit line BL0 and the ground voltage VSS.
- the second switch transistor 22b has a gate terminal connected to the bit switch line BS0, and switches connection and disconnection between the bit line BL0 and the sense amplifier 23.
- the third switch transistor 22c has a gate terminal connected to the bit switch line BS0, and switches connection and disconnection between the source line SL0 and the ground voltage VSS.
- the fourth switch transistor 22d has a gate terminal connected to the bit switch line BS1, and switches connection and disconnection between the source line SL0 and the sense amplifier 23.
- FIG. 7 a case where the memory cell MC0 connected to the word line WL0, the bit line BL0, and the source line SL0 of the memory array 10 is selected will be described.
- the bit switch line BS0 by selecting the bit switch line BS0, the switch transistors 22b and 22c are activated, the bit line BL0 is connected to the sense amplifier 23, and the source line SL0 is connected to the ground voltage VSS.
- FIG. 7 a case where the memory cell MC1 connected to the word line WL1, the bit line BL0, and the source line SL0 of the memory array 10 is selected will be described.
- the bit switch line BS1 by selecting the bit switch line BS1, the switch transistors 22a and 22d are activated, the source line SL0 is connected to the sense amplifier 23, and the bit line BL0 is connected to the ground voltage VSS.
- the bit switch line and the word line WL are selected, and a drain voltage (eg, 0.4 V) is applied to the bit line BL connected to the sense amplifier 23 or the source line SL, so that the memory cell
- a drain voltage eg, 0.4 V
- the sense amplifier 23 outputs “0” data.
- the sense amplifier 23 outputs “1” data.
- FIG. 8 is an operation waveform diagram during the read operation of the nonvolatile semiconductor memory device according to the present embodiment.
- the vertical axis represents voltage and the horizontal axis represents time.
- FIG. 8 is an operation waveform diagram in the case where “1” data is stored in the memory cell MC0 and “0” data is stored in the memory cell MC1 in FIG.
- FIG. 7 when the memory cell MC0 is selected, by selecting the bit switch line BS0 and the word line WL0 and applying the drain voltage to the bit line BL0, the memory cell current corresponding to the resistance state of the resistance change element RR0 is changed. Flowing. Since the resistance change element RR0 is in the low resistance state, the sense amplifier 23 determines that the read data is “1” data, and “1” data is output to the output terminal OUT.
- the sense amplifier 23 determines that the read data is “0” data, and “0” data is output to the output terminal OUT.
- the dotted lines related to the bit line BL0, the source line SL0, and the output terminal OUT are the operation waveforms of the prior art.
- the rise time of the bit line BL0 is t2
- the rise time of the output terminal OUT is t4.
- the rise time of the bit line BL0 is t1
- the rise time of the output terminal OUT is t3. It can be seen that the reading operation is speeded up.
- FIG. 9 is a diagram showing an example of a selected memory cell during a write operation of the nonvolatile semiconductor memory device according to this embodiment.
- the first switch transistor 22a has the gate terminal connected to the bit switch line BS1, and switches between connection and disconnection between the bit line BL0 and the ground voltage VSS.
- the second switch transistor 22b has a gate terminal connected to the bit switch line BS0, and switches connection and disconnection between the bit line BL0 and the write driver 24.
- the third switch transistor 22c has a gate terminal connected to the bit switch line BS0, and switches connection and disconnection between the source line SL0 and the ground voltage VSS.
- the fourth switch transistor 22d has a gate terminal connected to the bit switch line BS1, and switches connection and disconnection between the source line SL0 and the write driver 24.
- FIG. 9 a case where the memory cell MC0 connected to the word line WL0, the bit line BL0, and the source line SL0 of the memory array 10 is selected will be described.
- the bit switch line BS0 when resetting (programming), by selecting the bit switch line BS0, the switch transistors 22b and 22c are activated, the bit line BL0 is connected to the write driver 24, and the source line SL0 is connected to the ground voltage VSS. Connected to.
- the bit switch line BS1 is selected to activate the switch transistors 22a and 22d, the source line SL0 is connected to the write driver 24, and the bit line BL0 is connected to the ground voltage VSS.
- FIG. 9 the case where the memory cell MC1 connected to the word line WL1, the bit line BL0, and the source line SL0 of the memory array 10 is selected will be described.
- resetting programming
- the switch transistors 22a and 22d are activated, the source line SL0 is connected to the write driver 24, and the bit line BL0 is connected to the ground voltage VSS.
- the bit switch line BS0 is selected to activate the switch transistors 22b and 22c, the bit line BL0 is connected to the write driver 24, and the source line SL0 is connected to the ground voltage VSS.
- the bit switch line and the word line WL are selected, and the drain voltage (for example, 2.4 V) is applied to the bit line BL connected to the write driver 24 or the source line SL.
- the resistance changes to a high resistance state (“0” data) or a low resistance state (“1” data).
- the resistance changes to a high resistance state (“0” data)
- the resistance changes to a high resistance state (“0" data)
- the low resistance state (“1" Resistance changes to “data”.
- FIG. 10 is an operation waveform diagram during the write operation of the nonvolatile semiconductor memory device according to the present embodiment.
- the vertical axis represents voltage
- the horizontal axis represents time.
- the resistance change element RR1 when resetting (programming) the memory cell MC1, by selecting the bit switch line BS1 and the word line WL1, and applying the drain voltage Vreset to the bit line BL0, a positive voltage is applied to the upper electrode of the resistance change element RR1. When applied, the resistance change element RR1 changes its resistance to a high resistance state ("0" data).
- the dotted lines related to the bit line BL0 and the source line SL0 are the operation waveforms of the prior art.
- the rise time of the bit line BL0 is t2
- the rise time of the source line SL0 is t6.
- the rise time of the bit line BL0 is t1
- the rise time of the source line SL0 is t5. It can be seen that high-speed writing operation is realized.
- PLSEN shown in FIG. 9 and FIG. 10 is a clock signal indicating timing for applying a voltage to the bit line BL or the source line SL.
- the first and second memory cell array regions and the intersecting region are each assumed to be one, but a plurality of these may be arranged. This case will be described below.
- FIG. 11 is a diagram showing another configuration example of the memory array of FIG.
- the memory array 10 may include a plurality of memory cell arrays 11 to 1k (ARRAY1 to ARRAYk) and a plurality of intersecting regions 50 to 5k-2.
- k is an integer of 2 or more.
- ARRAY1 and ARRAY3 correspond to the first memory cell array region
- ARRAY2 and ARRAY4 correspond to the second memory cell array region.
- Crossing regions 50, 51, 52 are provided between ARRAYs 1, 2, ARRAYs 2, 3, and ARRAYs 3, 4.
- the number of word lines WL0_0 to WL0_n, WL1_0 to WL1_o, WLk-1_0 to WLk-1_p, WLk_0 to WLk_q connected to the memory cell arrays 11 to 1k are different. May be.
- n, o, p, q are integers of 0 or more.
- the bit line BL and the source line SL do not need to be cross-connected, and it is sufficient that at least a pair of the bit line BL and the source line SL are cross-connected. . Further, the pair of the bit line BL and the source line SL that are cross-connected may be different for each of the intersection regions 50 to 5k ⁇ 2. Hereinafter, this case will be described.
- FIG. 12 is a diagram showing still another configuration example of the memory array of FIG. As shown in FIG. 12, in a plurality of intersecting regions 50 to 5k-2 of the memory array 10, a part of a pair of bit lines BL0 to BLm and source lines SL0 to SLm is cross-connected and cross-connected.
- the pair of the bit line BL and the source line SL may be different for each of the intersecting regions 50 to 5k ⁇ 2.
- the bit lines BL and the source lines SL may be connected in each of the crossing regions 50 to 5k ⁇ 2.
- bit line BL and the source line SL to be cross-connected can be efficiently laid out, and the layout area required for the cross connection can be reduced.
- the nonvolatile semiconductor memory device of the present invention is not limited to the above-described examples, and various modifications and the like are made without departing from the scope of the present invention. It is also effective against
- the nonvolatile semiconductor memory device of the above embodiment is an example of a resistance change nonvolatile memory (ReRAM), but the present invention is a magnetoresistive nonvolatile memory (MRAM), a phase change nonvolatile memory.
- the present invention can also be applied to a nonvolatile semiconductor memory device such as a memory (PRAM: Phase Change Random Access Memory) or a ferroelectric nonvolatile memory (FeRAM: Ferroelectric Random Access Memory).
- bit lines BL and the source lines SL have been described as extending in the column direction, but may be extended in the row direction.
- the nonvolatile semiconductor memory device can equalize the load due to the wiring and vias of the bit line and the source line. Therefore, the voltage balance between when the resistance is increased and when the resistance is decreased is improved, and the basic characteristics of the nonvolatile memory such as the rewrite frequency characteristic and the data retention characteristic after rewriting are improved. Furthermore, the parasitic capacitance load at the time of data reading or data writing can be substantially halved, and the data reading time and data writing time can be increased. That is, it is possible to realize a nonvolatile memory that can cope with an increase in the number of guaranteed rewrites, an increase in the number of years of data retention, and an increase in data access time.
- Memory cell array (first memory cell array region) 12 memory cell array (second memory cell array region) 22a first switch transistor 22b second switch transistor 22c third switch transistor 22d fourth switch transistor 23 sense amplifier 24 write driver 50-5k-2 crossing region MC0 first memory cell MC1 second memory cell RR0 First variable resistance element RR1 Second variable resistance element TC0 First cell transistor TC1 Second cell transistor WL0_0 to WL0_n First word line WL1_0 to WL1_n Second word line BL0 to BLm First data line SL0 ⁇ SLm Second data line
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Abstract
Description
12 メモリセルアレイ(第2のメモリセルアレイ領域)
22a 第1のスイッチトランジスタ
22b 第2のスイッチトランジスタ
22c 第3のスイッチトランジスタ
22d 第4のスイッチトランジスタ
23 センスアンプ
24 ライトドライバ
50~5k-2 交差領域
MC0 第1のメモリセル
MC1 第2のメモリセル
RR0 第1の抵抗変化素子
RR1 第2の抵抗変化素子
TC0 第1のセルトランジスタ
TC1 第2のセルトランジスタ
WL0_0~WL0_n 第1のワード線
WL1_0~WL1_n 第2のワード線
BL0~BLm 第1のデータ線
SL0~SLm 第2のデータ線
Claims (14)
- 複数のメモリセルとして、少なくとも、
第1のセルトランジスタと、一端が前記第1のセルトランジスタのドレイン端に接続された第1の抵抗変化素子とを含む第1のメモリセルと、
第2のセルトランジスタと、一端が前記第2のセルトランジスタのドレイン端に接続された第2の抵抗変化素子とを含む第2のメモリセルとを有し、
前記複数のメモリセルにそれぞれ対応して設けられた複数のワード線として、
前記第1のセルトランジスタのゲート端に接続された第1のワード線と、
前記第2のセルトランジスタのゲート端に接続された第2のワード線とを有し、
前記第1のセルトランジスタのソース端と前記第2の抵抗変化素子の他端とを接続する第1のデータ線と、
前記第1の抵抗変化素子の他端と前記第2のセルトランジスタのソース端とを接続する第2のデータ線とを備えている
ことを特徴とする不揮発性半導体記憶装置。 - 行列状に配置され、セルトランジスタと前記セルトランジスタのドレイン端に接続された抵抗変化素子とをそれぞれ含む複数のメモリセルと、
前記複数のメモリセルの各行にそれぞれ対応して設けられ、当該対応するメモリセルに含まれるセルトランジスタのゲート端に共通に接続された複数のワード線と、
前記複数のメモリセルの各列あるいは各行にそれぞれ対応して設けられ、当該対応するメモリセルに含まれる抵抗変化素子に共通に接続された複数の第1のデータ線と、
前記複数のメモリセルの各列あるいは各行にそれぞれ対応して設けられ、当該対応するメモリセルに含まれるセルトランジスタのソース端に共通に接続された複数の第2のデータ線と、
前記複数のワード線のうち少なくとも1本のワード線を含む第1のメモリセルアレイ領域と、
前記第1のメモリセルアレイ領域に含まれるワード線とは異なる少なくとも1本のワード線を含む第2のメモリセルアレイ領域とを備え、
前記第1のメモリセルアレイ領域における前記複数の第1のデータ線と、前記第2のメモリセルアレイ領域における前記複数の第2のデータ線とはそれぞれ接続されており、
前記第1のメモリセルアレイ領域における前記複数の第2のデータ線と、前記第2のメモリセルアレイ領域における前記複数の第1のデータ線とはそれぞれ接続されている
ことを特徴とする不揮発性半導体記憶装置。 - 請求項2記載の不揮発性半導体記憶装置において、
前記第1および第2のメモリセルアレイ領域は隣り合うように配置されており、
前記第1および第2のメモリセルアレイ領域の間には、
前記第1のメモリセルアレイ領域における前記複数の第1のデータ線と、前記第2のメモリセルアレイ領域における前記複数の第2のデータ線とがそれぞれ接続され、かつ前記第1のメモリセルアレイ領域における前記複数の第2のデータ線と、前記第2のメモリセルアレイ領域における前記複数の第1のデータ線とがそれぞれ接続される交差領域が設けられている
ことを特徴とする不揮発性半導体記憶装置。 - 請求項3記載の不揮発性半導体記憶装置において、
複数の前記第1のメモリセルアレイ領域と、
前記複数の第1のメモリセルアレイ領域にそれぞれ隣り合うように配置された複数の前記第2のメモリセルアレイ領域と、
前記複数の第1および第2のメモリセルアレイ領域の間にそれぞれ配置された複数の前記交差領域とを備えている
ことを特徴とする不揮発性半導体記憶装置。 - 行列状に配置され、セルトランジスタと前記セルトランジスタのドレイン端に接続された抵抗変化素子とをそれぞれ含む複数のメモリセルと、
前記複数のメモリセルの各行にそれぞれ対応して設けられ、当該対応するメモリセルに含まれるセルトランジスタのゲート端に共通に接続された複数のワード線と、
前記複数のメモリセルの各列あるいは各行にそれぞれ対応して設けられ、当該対応するメモリセルに含まれる抵抗変化素子に共通に接続された複数の第1のデータ線と、
前記複数のメモリセルの各列あるいは各行にそれぞれ対応して設けられ、当該対応するメモリセルに含まれるセルトランジスタのソース端に共通に接続された複数の第2のデータ線と、
前記複数のワード線のうち少なくとも1本のワード線を含む第1のメモリセルアレイ領域と、
前記第1のメモリセルアレイ領域に含まれるワード線とは異なる少なくとも1本のワード線を含む第2のメモリセルアレイ領域とを備え、
前記第1のメモリセルアレイ領域における前記複数の第1および第2のデータ線のうち少なくとも1対の第1および第2のデータ線は、前記第2のメモリセルアレイ領域における前記複数の第1および第2のデータ線のうち少なくとも1対の第1および第2のデータ線と接続されており、前記第1のメモリセルアレイ領域における残りの前記複数の第1および第2のデータ線のうち少なくとも1対の第1および第2のデータ線は、前記第2のメモリセルアレイ領域における残りの前記複数の第1および第2のデータ線のうち少なくとも1対の第2および第1のデータ線と接続されている
ことを特徴とする不揮発性半導体記憶装置。 - 請求項5記載の不揮発性半導体記憶装置において、
前記第1および第2のメモリセルアレイ領域は隣り合うように配置されており、
前記第1および第2のメモリセルアレイ領域の間には、
前記第1のメモリセルアレイ領域における前記複数の第1および第2のデータ線のうち少なくとも1対の第1および第2のデータ線と、前記第2のメモリセルアレイ領域における前記複数の第1および第2のデータ線のうち少なくとも1対の第1および第2のデータ線とが接続され、かつ前記第1のメモリセルアレイ領域における残りの前記複数の第1および第2のデータ線のうち少なくとも1対の第1および第2のデータ線と、前記第2のメモリセルアレイ領域における残りの前記複数の第1および第2のデータ線のうち少なくとも1対の第2および第1のデータ線とが接続される交差領域が設けられている
ことを特徴とする不揮発性半導体記憶装置。 - 請求項6の不揮発性半導体記憶装置において、
複数の前記第1のメモリセルアレイ領域と、
前記複数の第1のメモリセルアレイ領域にそれぞれ隣り合うように配置された複数の前記第2のメモリセルアレイ領域と、
前記複数の第1および第2のメモリセルアレイ領域の間にそれぞれ配置された複数の前記交差領域とを備えている
ことを特徴とする不揮発性半導体記憶装置。 - 請求項7の不揮発性半導体記憶装置において、
前記複数の交差領域では、前記第1のメモリセルアレイ領域における前記少なくとも1対の第1および第2のデータ線と、前記第2のメモリセルアレイ領域における前記少なくとも1対の第2および第1のデータ線とがクロス接続されており、
前記複数の交差領域のうち第1および第2の交差領域において、クロス接続される、第1および第2のデータ線の対、ならびに第2および第1のデータ線の対が異なる
ことを特徴とする不揮発性半導体記憶装置。 - 請求項1,2または5記載の不揮発性半導体記憶装置において、
前記複数のメモリセルのいずれかに格納されたデータを判定するセンスアンプと、
前記第1のデータ線と接地電圧との接続および遮断を切り替える第1のスイッチトランジスタと、
前記第1のデータ線と前記センスアンプとの接続および遮断を切り替える第2のスイッチトランジスタと、
前記第2のデータ線と前記接地電圧との接続および遮断を切り替える第3のスイッチトランジスタと、
前記第2のデータ線と前記センスアンプとの接続および遮断を切り替える第4のスイッチトランジスタとを有する
ことを特徴とする不揮発性半導体記憶装置。 - 請求項9の不揮発性半導体記憶装置において、
前記複数のメモリセルのうち選択されたメモリセルに格納されたデータを読出すモードでは、前記選択されたメモリセルに対応する前記ワード線に電圧を印加し、
前記第1のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第2のデータ線に前記選択されたメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第2のスイッチトランジスタと前記第3のスイッチトランジスタとを活性化し、
前記第1のデータ線を前記センスアンプに接続し、
前記第2のデータ線を接地電圧に接続し、
前記第2のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第1のデータ線に前記選択されたメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第1のスイッチトランジスタと前記第4のスイッチトランジスタを活性化し、
前記第2のデータ線を前記センスアンプに接続し、
前記第1のデータ線を前記接地電圧に接続する
ことを特徴とする不揮発性半導体記憶装置。 - 請求項9の不揮発性半導体記憶装置において、
前記複数のメモリセルのうち選択されたメモリセルに格納されたデータを読出すモードでは、前記選択されたメモリセルに対応する前記ワード線に電圧を印加し、
前記第1のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第2のデータ線に前記選択したメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第1のスイッチトランジスタと前記第4のスイッチトランジスタとを活性化し、
前記第2のデータ線を前記センスアンプに接続し、
前記第1のデータ線を前記接地電圧に接続し、
前記第2のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第1のデータ線に前記選択されたメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第2のスイッチトランジスタと前記第3のスイッチトランジスタとを活性化し、
前記第1のデータ線を前記センスアンプに接続し、
前記第2のデータ線を前記接地電圧に接続する
ことを特徴とする不揮発性半導体記憶装置。 - 請求項1,2または5記載の不揮発性半導体記憶装置において、
前記複数のメモリセルのいずれかに書込み電圧を印加するドライバを備え、
前記第1のデータ線と接地電圧との接続および遮断を切り替える第1のスイッチトランジスタと、
前記第1のデータ線と前記ドライバとの接続および遮断を切り替える第2のスイッチトランジスタと、
前記第2のデータ線と前記接地電圧との接および遮断を切り替える第3のスイッチトランジスタと、
前記第2のデータ線と前記ドライバとの接続および遮断を切り替える第4のスイッチトランジスタとを有する
ことを特徴とする不揮発性半導体記憶装置。 - 請求項12の不揮発性半導体記憶装置において、
前記複数のメモリセルのうち選択されたメモリセルにデータを格納するモードでは、前記選択されたメモリセルに対応する前記ワード線に電圧を印加し、
前記第1のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第2のデータ線に前記選択されたメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第2のスイッチトランジスタと前記第3のスイッチトランジスタとを活性化し、
前記第1のデータ線を前記ドライバに接続し、
前記第2のデータ線を前記接地電圧に接続し、
前記第2のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第1のデータ線に前記選択されたメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第1のスイッチトランジスタと前記第4のスイッチトランジスタを活性化し、
前記第2のデータ線を前記ドライバに接続し、
前記第1のデータ線を前記接地電圧に接続する
ことを特徴とする不揮発性半導体記憶装置。 - 請求項12の不揮発性半導体記憶装置において、
前記複数のメモリセルのうち選択されたメモリセルにデータを格納するモードでは、前記選択されたメモリセルに対応する前記ワード線に電圧を印加し、
前記第1のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第2のデータ線に前記選択されたメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第1のスイッチトランジスタと前記第4のスイッチトランジスタを活性化し、
前記第2のデータ線をドライバに接続し、
前記第1のデータ線を接地電圧に接続し、
前記第2のデータ線に前記選択されたメモリセルの前記抵抗変化素子が接続され、かつ前記第1のデータ線に前記選択されたメモリセルの前記セルトランジスタのソース端が接続される場合には、
前記第2のスイッチトランジスタと前記第3のスイッチトランジスタとを活性化し、
前記第1のデータ線を前記ドライバに接続し、
前記第2のデータ線を前記接地電圧に接続する
ことを特徴とする不揮発性半導体記憶装置。
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