WO2007000809A1 - 半導体装置およびその制御方法 - Google Patents
半導体装置およびその制御方法 Download PDFInfo
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- WO2007000809A1 WO2007000809A1 PCT/JP2005/011815 JP2005011815W WO2007000809A1 WO 2007000809 A1 WO2007000809 A1 WO 2007000809A1 JP 2005011815 W JP2005011815 W JP 2005011815W WO 2007000809 A1 WO2007000809 A1 WO 2007000809A1
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- current
- circuit
- voltage conversion
- conversion circuit
- data line
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B99/00—Subject matter not provided for in other groups of this subclass
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0466—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells with charge storage in an insulating layer, e.g. metal-nitride-oxide-silicon [MNOS], silicon-oxide-nitride-oxide-silicon [SONOS]
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/26—Sensing or reading circuits; Data output circuits
- G11C16/28—Sensing or reading circuits; Data output circuits using differential sensing or reference cells, e.g. dummy cells
Definitions
- the present invention relates to a semiconductor device and a control method thereof, and more particularly to a semiconductor device having a nonvolatile memory cell array and a control method thereof.
- nonvolatile memories which are semiconductor devices capable of rewriting data
- a transistor constituting a memory cell has a floating gate or an insulating film called a charge storage layer. Data is stored by accumulating charges in the charge accumulation layer. When charge is accumulated in the trap layer, the threshold voltage of the transistor changes. Data is read by reading the threshold voltage of this transistor as the drain current value.
- Patent Document 1 discloses a transistor having two charge storage regions between a gate electrode and a semiconductor substrate. This transistor operates symmetrically by switching the source and drain. As a result, it has a virtual ground type structure that does not distinguish between the source region and the drain region.
- FIG. 1 is a diagram schematically drawn for explaining reading of data in the prior art.
- a core cell 12 that is a nonvolatile memory cell is arranged in the nonvolatile memory cell array 10. In fact, there are only a number of forces arranged here.
- the source of the transistor of the core cell 12 is connected to the ground, and the drain is connected to the core cell data line 14.
- a first current-voltage conversion circuit 16 (force code circuit) is connected to the core cell data line 14.
- a plurality of core cell data lines 14 and first current-voltage conversion circuits 16 are also arranged, but only one is described here.
- the reference cell 22 is connected to the second current current via the reference cell data line 24. It is connected to the pressure conversion circuit 26 (cascode circuit).
- the outputs of the first current-voltage conversion circuit 16 and the second current-voltage conversion circuit 26 are input to the sense amplifier 18, sensed, and output.
- a plurality of sense amplifiers 18 are also arranged, but only one is described here.
- Data reading from the core cell 12 is performed as follows. First, the first current-voltage conversion circuit 16 precharges the core cell data line 14 and sets the voltage value of the core cell data line 14 to a predetermined voltage value. Then, a current flows through the core cell 12 according to the data written in the core cell 12. The first current-voltage conversion circuit 16 converts this current value into a voltage value and outputs it to the sense amplifier 18.
- the threshold voltage of the transistor of the reference cell 22 is a reference threshold voltage for determining whether the data of the core cell 12 is “1” or “0”. Similar to the core cell side, the second current-voltage conversion circuit 26 precharges the reference cell data line 24, converts the current value of the reference cell 22 into a voltage value, and outputs it to the sense amplifier 18. The sense amplifier 18 compares the outputs of the first current-voltage conversion circuit 16 and the second current-voltage conversion circuit 26 and senses depending on whether the data written to the core cell 12 is “1” or “0”. Perform amplifier output.
- Patent Document 2 discloses a circuit that has a current-voltage conversion circuit for a core cell and a reference cell, and that inputs the output of the current-voltage conversion circuit for the reference cell to the current-voltage conversion circuit for the core cell.
- Patent Document 3 discloses a circuit in which a current-voltage conversion circuit includes a transistor for speeding up precharge.
- Patent Document 1 JP 2000-514946
- Patent Document 2 JP 2001-250391 A
- Patent Document 3 US Pat. No. 6,259,633
- data may be read simultaneously from many core cells 12 connected to the same word line.
- a memory device having a NOR type or virtual ground type memory cell array and having the same interface as a NAND type flash memory for example, 512 bits of data are read simultaneously from core cells connected to the same word line. This read operation is performed, for example, 32 times continuously.
- Each read data (total 2kByte) is stored in a register, and 16 bits are continuously output outside the register output chip.
- the first current-voltage conversion circuit 16 and the sense amplifier 18 are arranged for each core cell data line 14. For this reason, when data is simultaneously read from the core cell 12, the output from the second current / voltage conversion circuit 26 is input to each sense amplifier 18. For example, when data is read simultaneously at 512 bits, it is connected to two sense amplifiers 18.
- the output of the second current-voltage conversion circuit 26 is connected to 512 sense amplifiers 18.
- the output of the second current-voltage conversion circuit 26 is connected to 512 sense amplifiers 18.
- an object of the present invention is to provide a semiconductor device capable of reducing the precharge time of the reference cell data line and the data read time, and a control method therefor.
- the present invention includes a first current-voltage conversion circuit connected to a core cell provided in a nonvolatile memory cell array, a second current-voltage conversion circuit connected to a reference cell by a reference cell data line, A sense amplifier for sensing the output of the first current-voltage conversion circuit and the output of the second current-voltage conversion circuit; a comparison circuit for comparing the voltage value of the reference cell data line with a predetermined voltage value; And a charge circuit for charging the reference cell data line if the voltage value of the reference cell data line is lower than the predetermined voltage value when the reference cell data line is precharged.
- the charge circuit charges the reference cell data line in addition to the second current conversion circuit, so that the reference cell data line can be precharged at high speed. Can do. Therefore, a semiconductor device capable of reducing the data reading time can be provided.
- the charge circuit includes a gate connected to the output of the comparison circuit, a power source and the reference cell data line connected to a source and a drain.
- a semiconductor device including T can be obtained. According to the present invention, the charge circuit can be easily configured.
- the second current-voltage conversion circuit includes a first differential circuit to which a voltage value of the reference cell data line and the predetermined voltage value are input, and the comparison circuit
- the gate input of the FET having the gate connected to the output of the first differential circuit, the source and drain connected to the power supply and the output node, and the current source FET of the first differential circuit are A semiconductor device having a connected gate and a FET having a source and a drain connected to the output node and ground, and wherein the output terminal of the comparator circuit is connected to the output node; Can do.
- the comparison circuit can be easily configured by using the output of the differential circuit of the second current-voltage conversion circuit.
- the present invention may be a semiconductor device in which the predetermined voltage value is lower than a target voltage value when the reference cell data line is precharged. According to the present invention, it is possible to appropriately operate the charge circuit when charging by the charge circuit in which the voltage value of the reference cell data line is lower than the target voltage value is necessary.
- the second current-voltage conversion circuit has an average circuit that averages outputs of a plurality of reference cells, and the second current-voltage conversion circuit outputs an output of the average circuit.
- the semiconductor device can be made.
- cocell data can be determined more accurately by having a plurality of reference cells and averaging the outputs to obtain the output of the second current-voltage conversion circuit.
- the second current-voltage conversion circuit outputs to the first current-voltage conversion circuit and the sense amplifier
- the first current-voltage conversion circuit outputs the output of the core cell.
- a semiconductor device that differentially amplifies the output of the second current-voltage conversion circuit and outputs the differential amplifier to the send amplifier can be obtained. According to the present invention, since the difference between the data on the core cell side and the data on the reference cell side can be amplified before the final amplification operation is performed by the sense amplifier, the data in the core cell can be read more reliably. .
- the average circuit includes a first average circuit for outputting to the first current-voltage conversion circuit and a second average circuit for outputting to the sense amplifier. It can be a device. According to the present invention, it is possible to prevent the noise of the output of each averaging circuit from affecting one side.
- the present invention can be a semiconductor device including a sense control circuit that starts sensing of the sense amplifier after completion of precharging of the reference cell data line. According to the present invention, sensing of the sense amplifier can be performed after the precharge of the reference cell data line is completed. Therefore, accurate and high-speed sensing can be realized.
- the present invention can be a semiconductor device in which the sense control circuit starts sensing of the sense amplifier by turning on the output of the first current-voltage conversion circuit. According to the present invention, after the precharge of the reference cell data line is completed, the sense amplifier can be sensed using the voltage on the reference side in a stable state by turning on the output of the first current-voltage conversion circuit. . Therefore, more accurate and faster sensing can be realized.
- the present invention may be a semiconductor device in which the sense control circuit includes an FET connected between the output of the first current-voltage conversion circuit and a power supply. According to the present invention, the sense control circuit can be easily configured.
- the nonvolatile memory cell array can be a semiconductor device having a SONOS type cell.
- the data read time can be shortened in the SONOS type flash memory.
- the present invention can also be a semiconductor device in which the core cell is a cell capable of storing a plurality of bits. According to the present invention, data read time can be shortened in a flash memory having cells capable of storing a plurality of bits.
- the present invention provides a first current-voltage conversion circuit connected to a core cell provided in a nonvolatile memory cell array, a second current-voltage conversion circuit connected to a reference cell by a reference cell data line,
- a control method of a semiconductor device including a sense amplifier that senses the output of the first current-voltage conversion circuit and the output of the second current-voltage conversion circuit, the voltage value of the reference cell data line And the reference cell data line are precharged and the reference cell data line is precharged. And charging the reference cell data line if the voltage value of the data line is lower than a predetermined voltage value.
- the charge circuit when the reference cell data line is precharged, in addition to the second current conversion circuit, the charge circuit precharges the reference cell data line at a high speed by charging the reference cell data line. can do. Therefore, it is possible to provide a method for controlling a semiconductor device capable of reducing the data reading time.
- the present invention includes a step of averaging outputs of a plurality of reference cells, and a method of controlling a semiconductor device in which an output of the second current-voltage conversion circuit is the averaged output. Can do.
- the data of the core cell can be determined more accurately by averaging the outputs of the plurality of reference cells and using them as the output of the second current-voltage conversion circuit.
- the present invention can be a semiconductor device control method including a step of starting sensing after the voltage value of the reference cell data line is stabilized.
- the sense amplifier can be sensed after the precharge of the reference cell data line is completed. Therefore, accurate and high-speed sensing can be realized.
- FIG. 1 is a diagram showing a peripheral configuration of a memory cell array and a current-voltage conversion circuit of a flash memory according to the prior art.
- FIG. 2 is a diagram showing a configuration around a memory cell array and a current-voltage conversion circuit of the flash memory according to the first embodiment.
- FIG. 3 is a diagram showing a peripheral configuration of a memory cell array and a current-voltage conversion circuit of a flash memory according to a second embodiment.
- FIG. 4 shows a timing when data is read from the core cell of the flash memory according to the second embodiment. This is a chart.
- FIG. 5 is a circuit diagram of a second current-voltage conversion circuit of the flash memory according to the second embodiment.
- FIG. 6 is a circuit diagram of an average circuit of a flash memory according to the second embodiment.
- FIG. 7 is a circuit diagram of a first current-voltage conversion circuit of a flash memory according to Embodiment 2.
- FIG. 8 is a circuit diagram of a sense amplifier of a flash memory according to the second embodiment.
- FIG. 9 shows the time dependence of each signal when reading data from the core cell of the flash memory according to the second embodiment.
- FIG. 2 is a configuration diagram around the memory cell and the sense amplifier of the nonvolatile memory according to the first embodiment.
- a core cell 12 which is a nonvolatile memory cell is arranged in the nonvolatile memory cell array 10.
- the source of the transistor of the core cell 12 is connected to the ground, and the drain is connected to the core cell data line 14.
- the first current-voltage conversion circuit 16 (cascode circuit) is connected to the core cell 12 via the core cell data line 14.
- the second current-voltage conversion circuit 26 (cascode circuit) is connected to the reference cell 22 via the reference cell data line 24.
- the sense amplifier 18 is sensed by connecting the outputs of the first current-voltage conversion circuit 16 and the second current-voltage conversion circuit 26.
- a plurality of core cells 12, core cell data lines 14, first current-voltage conversion circuits 16 and sense amplifiers 18 are arranged, but only one is described here.
- the second current-voltage conversion circuit 26 outputs to many sense amplifiers 18.
- a comparison circuit 28 that compares the voltage value of the reference cell data line 24 with a predetermined voltage value (Vref) is provided, and a charge circuit 30 that charges the reference cell data line 24 by the output of the comparison circuit 28 is provided.
- the comparison circuit 28 compares the voltage value of the reference cell data line with a predetermined voltage value (Vref), and outputs a charge signal if the voltage value of the reference cell data line 24 is lower than Vref.
- Vref a predetermined voltage value
- the charge circuit 30 connects the power source (Vcc) to the reference cell data line 24 and charges the reference cell data line 24.
- Vcc power source
- the charge circuit 30 is connected to the large number of second current conversion circuits 26 connected to many sense amplifiers 18 in addition to the reference cell data line 24.
- the reference cell data line 24 can be precharged at high speed. Therefore, the data read time can be shortened.
- Vref By setting Vref to be equal to or lower than the target voltage value of the reference cell data line 24 at the time of precharging, charging by the charge circuit 28 in which the voltage value of the reference cell data line 24 is lower than the target voltage value is required. At this time, the charge circuit 28 can be appropriately operated.
- the memory cell array of the second embodiment is a SONOS type nonvolatile memory cell array described in Patent Document 1, and employs a virtual ground type array system.
- data reading is simultaneously performed by many bits (512 bits in the second embodiment) of core cells connected to the same word line.
- two bits can be stored in one core cell, and the storage capacity density is improved.
- the description is complicated, in the following description, only one bit is stored in the core cell and one bit is read from the core cell.
- the method of reading 2 bits in the core cell, and reading 1 bit out of them, can be realized by performing the reading described below using a reference that has two different reference cell forces.
- FIG. 3 is a configuration diagram around the memory cell and the sense amplifier of the nonvolatile memory according to the second embodiment.
- the nonvolatile memory cell array 40 includes a core cell region 50 and a reference cell region.
- the core cell 52 is arranged in a matrix in the core cell region 50.
- the gates of the transistors constituting the core cell 52 are connected to the word line 42, and the source and drain are connected to the core cell data line 54.
- the core cell data line 54 When the drain selection line 46 (YSD) is at the high level, the core cell data line 54 is turned on and connected to the first current-voltage conversion circuit 70, and the source selection line 48 (YSS) is When high, it is connected to ground (Vss).
- the core cell data line 54 When data is read from the core cell 52, the core cell data line 54 is appropriately selected by the drain selection line 46 (YSD) and the source selection line 48 (YSS).
- a voltage is applied to the word line 42 connected to the core cell 52, and the core cell data line 54 is connected to the first current-voltage conversion circuit 70 and connected to the core cell 52.
- the other core cell data line is connected to Vss.
- the first current-voltage conversion circuit 70 precharges the core cell data line 54 to 1.4 V, for example. Then, the current value flowing through the core cell 52 is converted into a voltage value and output (SAI) to the sense amplifier 160.
- SAI voltage value and output
- the first current-voltage conversion circuit 70 and the sense amplifier 160 are arranged in 512 pieces, which is the number of core cells 52 that simultaneously read data.
- the reference cell 62 arranged in the reference cell region 60 is connected to the same drain line 42 as the core cell 52.
- the reference cell 62 is connected to the reference cell data line 64, and the drain and source are selected by the drain selection FET 66 and the source selection FET 68 in a timely manner.
- a voltage is applied to the word line 42 connected to the reference cell 62, and the reference cell data line 64 is connected to the second current-voltage conversion circuit AlOOa to connect to the core cell.
- the other core cell data line connected to 52 is connected to Vss.
- the charge loss increases with the number of write / erase times. Therefore, it is preferable to arrange the reference cell 62 in the nonvolatile memory cell array 40 and experience the same number of write / erase times as the core cell 52. Therefore, it is preferable that the reference cell 62 is disposed in the nonvolatile memory cell array 40 and connected to the same word line 42.
- the reference cell region 60 has two reference cells 62 corresponding to "1" and "0".
- the average threshold voltage of these reference cells is used to determine the threshold voltage of the core cell 52 to determine whether the data power of the core cell 52 is “1” or “0.” Therefore, the second current voltage
- the conversion circuit 100 includes a second current-voltage conversion circuit AlOOa connected to the reference cell corresponding to “1”, a second current-voltage conversion circuit BlOOb connected to the reference cell corresponding to “0”, and It has an averaging circuit 130 that averages the outputs of the two reference cells corresponding to “1” and “0”.
- the second current-voltage conversion circuit AlOOa and the second current-voltage conversion circuit BlOOb precharge the respective reference cell data lines 64 to 1.4V.
- the second current-voltage conversion circuit AlOOa and the second current-voltage conversion circuit BlOOb have a comparison circuit and a charge circuit not shown in FIG. 3, but the configuration and operation will be described later.
- the second current-voltage conversion circuit AlOOa and the second current-voltage conversion circuit BlOOb convert the current value of the corresponding reference cell 62 into a voltage value, and the average circuit 130 receives REFA and REFB. Output.
- the average circuit 130 averages the output values (REFA, REFB) of the second current-voltage conversion circuit AlOOa and the second current-voltage conversion circuit BlOOb. Then, as the output of the second current-voltage conversion circuit 100, REFBI AS and S AREF are output to the first current-voltage conversion circuit 70 and the sense amplifier 160, respectively.
- the threshold voltage distribution has changed due to the charge loss. Even in this case, the data of the core cell 52 can be determined more accurately.
- the output of the current-voltage conversion circuit 2 of AlOOa can be used as the output of the second current-voltage conversion circuit 100.
- it has three or more reference cells, and the averaging circuit 130 can be configured to average them. Good.
- FIG. 4 is a timing chart at the time of data reading.
- FIG. 5 is a circuit diagram of the second current-voltage conversion circuit AlOOa. Since the second current-voltage conversion circuit BlOOb is a similar circuit, description thereof is omitted.
- the signal on the reference cell data line 64 is DATABREF, which is connected to terminal 123 and becomes CASFB.
- the differential circuit 129 includes P-FETs 101 and 102, N-FETs 106, 107, and 108, and is provided between the power supply Vcc and the ground.
- the reference voltage value (CASREF) is input to the gate (terminal 125) of the FET 106, and the voltage value (CASFB) of the reference cell data line 64 is input to the gate (terminal 126) of the FET 107.
- the FET 108 is a current source that adjusts the current of the differential circuit 129, a predetermined reference voltage CASBIAS is input to the gate, and the source and drain are connected to the ground, the FET 106, and the FET 107.
- the FET 109 is connected between the FET 108 and the ground, and a switch signal (PDCAS B: complementary line of PDCAS) is input to the gate to turn on and off the differential circuit.
- PDCAS B complementary line of PDCAS
- the output signal (REFA) of the differential circuit 129 is output to the terminal 124.
- the output signal (REFA) of the differential circuit 129 is connected to the gate of P-FET104.
- the source and drain of the P-FET 104 are connected to the power source Vcc and the reference cell data line 64 via the P-FET 103 whose gate is grounded.
- the P-FET105 is connected between the power supply Vcc and the terminal 124, and a switch signal (PDCASB) is input to the gate to turn this circuit on and off.
- PDCASB switch signal
- the switch signal (PDCASB) goes high, the voltage value of the reference cell data line 64 (CASFB) is lower than the reference voltage value (CASREF)! The reference cell data line 64 is charged.
- the voltage value (CASFB) of the reference cell data line 64 is higher than the reference voltage value (CASREF) !, the current of the FET 104 decreases. In this way, the reference cell data line 64 is precharged to the reference voltage value (CASREF).
- the reference voltage value is 1.4V.
- REFBIAS136a and SAREF136b are connected to 512 first current-voltage conversion circuits 70 and sense amplifier 160, respectively, it takes time to stabilize the voltages of REFBIAS136a and SAREF136b after the sensing starts. End up.
- a comparison circuit 110 and a charge circuit 120 are further provided.
- the comparison circuit 110 includes P-FETs 111 and 112 and N-FETs 113 and 114.
- FET11 1 has its gate connected to the output of differential circuit 129 and its source and drain connected to the power supply Vss. Connected to output node 128.
- the gate of FET 113 is connected to the gate input (CASBIAS) of current source FET 108 of differential circuit 129, and the source and drain are connected to ground Vcc and output node 128.
- the output node 128 inverts the signal via the inverter 115 and outputs it to the output terminal 116 of the comparison circuit 110 (CCNTL).
- the output timing of the comparison circuit 110 is determined by the difference in the W (gate width) ratio between the FET 111 and the FET 113 and the W (gate width) ratio between the FET 102 and the FET 108. If the ratio of these two ratios is almost the same, the output signal (CCNTL) becomes low when the voltage value (CASFB) of the reference cell data line 64 is lower than the reference voltage value (CASREF) of 1.4V. High is high.
- the W of FET113 is set slightly larger and is set so that the output signal (CCNTL) is switched at 1.3 V, which is slightly lower than the reference voltage value (CASREF).
- the voltage value switched by the comparison circuit 110 is preferably slightly lower than the reference voltage value (CASREF). This is because when sensing, if the charge circuit 120 is on, the load changes and accurate sensing becomes difficult. Therefore, this voltage value is determined by the precharge time and the timing at which the charge circuit 120 is not turned on during sensing.
- the comparison circuit 110 selects the voltage value (predetermined voltage value) to be switched by selecting the ratio of W (gate width) of the FET 111 and the FET 113 and the ratio of W of the FET 102 and the FET 108 in advance. I can decide. Then, the voltage value (CASF B) of the reference cell data line 64 is compared with a predetermined voltage value, and the voltage value (CASFB) of the reference cell data line 64 is output to a low level that is lower than the predetermined voltage value. And outputs a high level.
- the voltage value (CASF B) of the reference cell data line 64 is compared with a predetermined voltage value, and the voltage value (CASFB) of the reference cell data line 64 is output to a low level that is lower than the predetermined voltage value. And outputs a high level.
- the charge circuit 105 has a P-FET 121.
- the output (CCNTL) of the comparison circuit 110 is connected to the gate terminal 122, and the power source Vcc and the reference cell data line 64 are connected to the source and drain via the FET 104.
- the power source Vcc is connected to the FET 104, and the reference cell data line 64 is charged.
- the reference cell device by the second current-voltage conversion circuit 100a is turned on.
- One-line (BL) precharge is started. Initially, the reference cell data line (BL) is equal to or lower than a predetermined voltage value of the reference voltage value (CASREF) —0.IV, so the output signal (CCNTL) of the comparison circuit 110 is at a low level. Therefore, the charge circuit 120 is turned on and precharge is performed.
- the reference cell data line (BL) becomes CASREF-0.IV
- the output signal (CCNTL) of the comparison circuit 110 becomes high level, and the charge circuit 110 is turned off.
- the core cell data line 54 is precharged by the first current-voltage conversion circuit 70.
- the nonvolatile memory according to Example 2 includes the comparison circuit 110 and the charge circuit 120.
- the comparison circuit 110 outputs a low level to the charge circuit if the voltage value (CASFB) of the reference cell data line 64 is lower than the predetermined voltage value (1.3V), and the charge circuit 120 is turned on, and the reference cell data Line 64 is charged.
- CASFB voltage value of the reference cell data line 64
- the predetermined voltage value 1.3V
- the charge circuit can be easily configured by configuring the charge circuit 120 with an FET.
- the comparison circuit 110 can easily configure a comparison circuit by using the output of the differential circuit of the second current-voltage conversion circuit AlOOa.
- the current value flowing through the reference cell 62 is output from the second current-voltage conversion circuit AlOOa as the gate voltage value (REFA) corresponding to the current value flowing through the FET 104.
- REFA gate voltage value
- REFB is output from the second current-voltage conversion circuit BlOOb.
- FIG. 6 is a circuit diagram of the average circuit 130.
- the average circuits 130a and 130b are the same circuits except that their outputs are different from REFBIAS and SAREF, respectively.
- the average circuit 130a has P-F ET 131a, 132b, 133a, 134a and N-FET 135a.
- the FETs 131a and 133a are current sources whose gates are grounded. REFA and REFB are input to the gates of FETs 138a and 139a, respectively, FETs 131a and 132a are connected to the sources, and the drains are connected to the output terminal 136a.
- the FET 135a has a gate and a drain connected to the output terminal 136a and a source grounded.
- the average circuit 130b is the same as the average circuit 130a, and a description thereof will be omitted.
- the output signal (REFBIAS) of the average circuit 130a (first average circuit) is output to the first current-voltage conversion circuit 70, and the output signal (SAREF) of the average circuit 130b (second average circuit) is the sense amplifier 160. Is output.
- REFBIAS the output signal of the average circuit 130a
- SAREF the average circuit 130b
- one average circuit may be used and the output may be divided into REFBIAS and SAREF, by providing two average circuits, it is possible to prevent REFBIAS or SAREF noise from affecting the other.
- FIG. 7 is a circuit diagram of the first current-voltage conversion circuit 70.
- the core cell data line 54 is connected to the terminal 83, and its voltage value (DATAB) is CASFB.
- P—A current mirror type differential circuit 99 having FETs 71 and 72 and N-FETs 76, 86, and 78 is provided, and the reference voltage value (CASREF) and the voltage value of the core cell data line 54 (CASFB) are input 76 respectively.
- 77 and CASCTL is output to terminal 84.
- FET 78 and FET 79 have the same functions as FETs 108 and 109 in FIG.
- the first current-voltage conversion circuit 70 has P-FETs 73, 74, 75, 80 and N-FET81.
- P-FETs 73, 74, and 75 have the same functions as FETs 103, 104, and 105 in Fig. 5, respectively. That is, when the voltage value of the core cell data line 54 is lower than the reference voltage value (CASREF), the FET 74 passes a large amount of current, and the voltage value of the core cell data line 54 is set as the reference voltage value (CASREF).
- the reference voltage value (CA SREF) is 1.4V.
- the P-FET 73 is provided to suppress the peak current while the core cell data line 54 is being charged. As a result, when a large number of core cells such as 512 bits are simultaneously read, the total charge current can be suppressed to a predetermined value or less.
- the gate is connected to the terminal 84, and the source and drain are connected to the power supply Vcc and the output terminal 82 of the first current / voltage conversion circuit 70 via the sense control circuit 90.
- the gate is connected to the output (REFBIAS) of the second current-voltage conversion circuit 100, and the source and drain are connected to the ground and the terminal 82.
- the circuit 98 having FETs 80 and 81 and the FETs 133a, 134a, and 135a in FIG. 6 are provided.
- the circuit 137b forms a differential circuit.
- the level of terminal 84 (CASCTL) and the average value of REFA and REFB are differentially amplified.
- the output signal (SAI) of the first current-voltage conversion circuit 70 is input to the sense amplifier 160. That is, the first current / voltage conversion circuit 70 differentially amplifies the output of the core cell 52 and the output of the second current / voltage conversion circuit 100 and outputs the result to the sem amp 160.
- the difference between the data on the core cell side and the data on the reference cell side can be amplified before the final amplification operation by the sense amplifier 160, so the data in the core cell 54 can be read more reliably. .
- the output of the second current-voltage conversion circuit 100 is output only to the sense amplifier 160.
- the sense amplifier 160 the first current-voltage conversion circuit 70 and the second current-voltage conversion are performed.
- Data of the core cell 52 may be read by the output of the circuit 100.
- the first current / voltage conversion circuit 70 further includes a sense control circuit 90.
- the sense control circuit 90 has a P-FET 91.
- the FET 91 has an input signal (SAI-SET) connected to the gate, and a power source Vcc and FET 80 (that is, the output terminal 82 of the first current-voltage conversion circuit 70) connected to the source and drain.
- SAI-SET input signal
- Vcc and FET 80 that is, the output terminal 82 of the first current-voltage conversion circuit 70
- the sense control circuit 120 1 Turns on the output of the current-voltage converter circuit 70 and starts sensing of the sense amplifier 160.
- the reason why the first current-voltage conversion circuit 70 is turned on after the precharge of the reference cell data line 64 is completed is as follows. If the first current-voltage conversion circuit 70 is also turned on when the precharge of the reference cell data line 64 is started, the voltage of SAI may be raised to a relatively high voltage because it is unstable. At this time, the FET 81 passes a current to the ground so that SAI is lowered to the stable potential region. However, since the gate terminal 87 is connected to the gate terminal 136a of the FET 135a which is diode-connected, the terminal 87 is not so high and voltage, so the current supply capability of the FET 81 is low.
- FIG. 8 is a circuit diagram of the sense amplifier 160.
- Current mirror type differential circuit 175 having P-FET161, 162 and N-FET166, 167, 168, amplifier circuit 176 having P-FET163 and N-FET169, inverter 177 having P-FET165, N-FET171 is doing.
- FETs 164, 170, and 172 are switches that generate sense amplifiers by means of switch signals PDCASB and INVSW.
- the output (SAI) of the first current-voltage conversion circuit 70 and the output (SAREF) of the second current-voltage conversion circuit 100 are input to the inputs 174 and 173 of the differential circuit 175, respectively. If the output signal (SAI) of the first current-voltage conversion circuit 70 is lower than the output signal (SA REF) of the second current-voltage conversion circuit 100, the amplifier circuit 176 outputs a low level and the inverter 177 outputs a high level. Is output. If SAI is higher than SAREF, the amplifier circuit 176 outputs a high level, and the inverter 177 outputs a low level.
- the value of the current flowing through the core cell 52 is referred to. It is compared with the current value flowing through the cell 62 to determine whether the core cell 52 is “1” or “0”.
- FIG. 9 shows the time dependence of the voltages of the output signals (REFBIAS and SAREF) of the second current-voltage conversion circuit 100 and the output signal (SAI) of the first current-voltage conversion circuit 70 in Example 2. It is a figure which shows the result of having measured. The horizontal axis is time, and the vertical axis is voltage. The solid line indicates the result of Example 2, and the broken line indicates the result when the comparison circuit 110 and the charge circuit 120 are not provided. It is fruit.
- the time for the output signals (REFBIAS and SAREF) of the second current-voltage conversion circuit 100 to become stable is trl (about 25 ns) earlier in the embodiment than in the conventional example. Therefore, the timing when SAI-SET is set to the low level can also be shortened by trl. As a result, the sensing time was reduced by trl.
- the flash memory according to the second embodiment is a SONOS type flash memory that can store a plurality of bits in a core cell and has a virtual ground type array system. And it has the same memory cell array as the memory cell array used as the NOR type. Since the memory cell array used as the NOR type is used and the NAND type flash memory interface (NAND IZF) is provided, the load on the output of the second current-voltage conversion circuit 100 becomes particularly large. For this reason, a big effect can be produced by applying the present invention.
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Abstract
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Priority Applications (15)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200580050283XA CN101208754B (zh) | 2005-06-28 | 2005-06-28 | 半导体器件及其控制方法 |
PCT/JP2005/011815 WO2007000809A1 (ja) | 2005-06-28 | 2005-06-28 | 半導体装置およびその制御方法 |
EP05765396A EP1909289A1 (en) | 2005-06-28 | 2005-06-28 | Semiconductor device and control method thereof |
JP2007523258A JP4922932B2 (ja) | 2005-06-28 | 2005-06-28 | 半導体装置およびその制御方法 |
KR1020077030629A KR100935949B1 (ko) | 2005-06-28 | 2005-06-28 | 반도체 장치 및 그의 제어 방법 |
US11/478,554 US7596032B2 (en) | 2005-06-28 | 2006-06-28 | Semiconductor device and control method therefor |
US12/512,741 US7978523B2 (en) | 2005-06-28 | 2009-07-30 | Semiconductor device and control method of the same |
US12/512,638 US7969787B2 (en) | 2005-06-28 | 2009-07-30 | Semiconductor device and control method of the same |
US12/819,071 US8045388B2 (en) | 2005-06-28 | 2010-06-18 | Semiconductor device and control method of the same |
US12/901,990 US8264901B2 (en) | 2005-06-28 | 2010-10-11 | Semiconductor device and control method of the same |
US12/905,716 US8130584B2 (en) | 2005-06-28 | 2010-10-15 | Semiconductor device and control method of the same |
US13/253,634 US8351268B2 (en) | 2005-06-28 | 2011-10-05 | Semiconductor device and control method of the same |
US13/413,527 US8705303B2 (en) | 2005-06-28 | 2012-03-06 | Semiconductor device and control method of the same |
US13/610,368 US8611167B2 (en) | 2005-06-28 | 2012-09-11 | Semiconductor device and control method of the same |
US14/081,987 US8995215B2 (en) | 2005-06-28 | 2013-11-15 | Semiconductor device and control method of the same |
Applications Claiming Priority (1)
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PCT/JP2005/011815 WO2007000809A1 (ja) | 2005-06-28 | 2005-06-28 | 半導体装置およびその制御方法 |
Related Child Applications (2)
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US11/478,554 Continuation US7596032B2 (en) | 2005-06-28 | 2006-06-28 | Semiconductor device and control method therefor |
US11/478,554 Continuation-In-Part US7596032B2 (en) | 2005-06-28 | 2006-06-28 | Semiconductor device and control method therefor |
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US (10) | US7596032B2 (ja) |
EP (1) | EP1909289A1 (ja) |
JP (1) | JP4922932B2 (ja) |
KR (1) | KR100935949B1 (ja) |
CN (1) | CN101208754B (ja) |
WO (1) | WO2007000809A1 (ja) |
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- 2005-06-28 KR KR1020077030629A patent/KR100935949B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
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KR100935949B1 (ko) | 2010-01-12 |
US20140208554A1 (en) | 2014-07-31 |
KR20080021712A (ko) | 2008-03-07 |
CN101208754A (zh) | 2008-06-25 |
US7978523B2 (en) | 2011-07-12 |
US20110182116A1 (en) | 2011-07-28 |
CN101208754B (zh) | 2011-02-02 |
US7969787B2 (en) | 2011-06-28 |
US8611167B2 (en) | 2013-12-17 |
US20070002639A1 (en) | 2007-01-04 |
EP1909289A1 (en) | 2008-04-09 |
US20090285019A1 (en) | 2009-11-19 |
US20100290291A1 (en) | 2010-11-18 |
US20130064016A1 (en) | 2013-03-14 |
US8264901B2 (en) | 2012-09-11 |
US20120069676A1 (en) | 2012-03-22 |
US20130155774A1 (en) | 2013-06-20 |
US20110032764A1 (en) | 2011-02-10 |
US8995215B2 (en) | 2015-03-31 |
JPWO2007000809A1 (ja) | 2009-01-22 |
US8130584B2 (en) | 2012-03-06 |
US8351268B2 (en) | 2013-01-08 |
US8045388B2 (en) | 2011-10-25 |
US20090290425A1 (en) | 2009-11-26 |
US7596032B2 (en) | 2009-09-29 |
US8705303B2 (en) | 2014-04-22 |
JP4922932B2 (ja) | 2012-04-25 |
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