WO1992006475A1 - Semiconductor memory - Google Patents
Semiconductor memory Download PDFInfo
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- WO1992006475A1 WO1992006475A1 PCT/JP1991/001323 JP9101323W WO9206475A1 WO 1992006475 A1 WO1992006475 A1 WO 1992006475A1 JP 9101323 W JP9101323 W JP 9101323W WO 9206475 A1 WO9206475 A1 WO 9206475A1
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- wiring
- redundancy
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- defective
- selecting
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- 239000004065 semiconductor Substances 0.000 title claims description 28
- 230000002950 deficient Effects 0.000 claims description 99
- 238000012360 testing method Methods 0.000 claims description 99
- 230000007547 defect Effects 0.000 claims description 22
- 238000010586 diagram Methods 0.000 description 18
- 230000006870 function Effects 0.000 description 14
- 230000014759 maintenance of location Effects 0.000 description 6
- 102100031658 C-X-C chemokine receptor type 5 Human genes 0.000 description 5
- 101000922405 Homo sapiens C-X-C chemokine receptor type 5 Proteins 0.000 description 5
- 238000013500 data storage Methods 0.000 description 3
- 239000002784 hot electron Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000009662 stress testing Methods 0.000 description 2
- 241000270666 Testudines Species 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/70—Masking faults in memories by using spares or by reconfiguring
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C29/18—Address generation devices; Devices for accessing memories, e.g. details of addressing circuits
- G11C29/24—Accessing extra cells, e.g. dummy cells or redundant cells
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/50—Marginal testing, e.g. race, voltage or current testing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/70—Masking faults in memories by using spares or by reconfiguring
- G11C29/78—Masking faults in memories by using spares or by reconfiguring using programmable devices
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
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- 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
Definitions
- the present invention relates to a semiconductor memory, and more particularly to a memory having a function of performing a reliability test (drain stress test) or a burn-in test for knowing data retention characteristics of a drain side of a memory cell.
- the memory cell normally used in EPR OM (E 1 ectrica 1 y Progra mmable and E rasab 1 e R OM), a type of semiconductor memory, has a two-layer gate structure consisting of a control gate and a floating gate. It is composed of a transistor having.
- a high potential (write potential VPP) is applied to the word line connected to the control gate and the bit line connected to the drain. Is done.
- the source is fixed at the ground potential.
- a high electric field is applied near the drain of the channel region of the memory cell, and a channel hot electron is generated.
- the hot electron is floated by the high potential applied to the control gate. Injected into ling gate. Hot electron is injected into the floating gate.
- the threshold value of the obtained memory cell rises from the viewpoint of the control gate, and the change in the threshold value stores data.
- FIG. 1 shows a partial configuration of an EPROM in which a plurality of memory cells having the above structure are provided and arranged in an array.
- M1 to M4 are memory cells
- WL1 and WL2 are word lines
- BL1 and BL2 are bit lines
- 1A and 1B are power ram decoders
- 5 is a decode signal of a column decoder
- 6 is a row decoder.
- Dl, D2, Hl, and H2 are transistors for selecting bit lines
- S is a transistor for writing.
- bit line selection is performed so that one bit line is selected according to decode signals 2 to 5 from column decoders 1A and 1B.
- Transistors Dl, D2, HI, H2 are selectively driven.
- the bit line BL1 and the word line WL1 are selected, and a high potential is applied to each of them.
- the other memory cell M2 whose drain is connected to the selected bit line BL1 is in a non-selected state, and its control gate is at the ground potential while the bit line BL1 A high potential will be applied to the drain that is completely connected to.
- Such a state can occur when the number of memory cells connected to one bit line is N (N ⁇ 1).
- electrical stress is applied to the drain, and if the quality of the gate oxide film is poor, the memory cell is implanted into a floating gate. There is a possibility that the electron will escape, and the data once written may disappear.
- bit line select transistors Dl, D2, HI, H2 are simultaneously turned on. Further, a high potential VPP for writing is applied to the drain and gate of the writing transistor S in the same manner as in writing data.
- both memory cells M1 and M2 connected to the bit line BL1 are all at the ground potential, both memory cells are in a non-conductive state.
- the same level of potential is applied to the drains of both memory cells, after which a reliability check is performed.
- a defective leak path 7 exists in the bit line BL2, and the ground line voltage is determined from the bit line potential.
- memory cells are omitted for simplicity of explanation.
- There are various possible causes of this defective leak path such as a short between the pit line and the drain of the memory cell and the substrate or the ground line.
- An EPROM with such a leak path is generally treated as a defective product, but it can be made a complete product if there is a column redundancy circuit.
- the redundancy D1 and H2 replace the two transistors D1 and H2. If the selection transistor DR is selected, the defective bit line BL2 can be replaced with the redundancy bit line BLR.
- the write transistor S and the bit line are determined based on the write potential VPP applied to the drain of the write transistor S.
- a current leak path up to the ground current is formed through the selection transistors D 1 and H 2, through the bit line BL 2 and the defective leak path 7.
- the node 11 'to which the source of the write transistor S is connected is connected.
- the potential is lower than the potential of the node 11 to which the source of the writing transistor S is connected in FIG. 1, and the source of the bit line selection transistor D 1 is connected in FIG.
- the potential of the node 12 is lower than the potential of the node 11 ′. At the time of the stress test, it is necessary that the same potential as node 11 be applied to all bit lines.
- FIG. 2 shows a state in which two bit lines are connected to the node 12 for simplicity of explanation. Actually, the number of nodes such as eight and sixteen is shown. Bit line is connected. Therefore, when the potential of the node 11 ′ becomes lower than the potential of the node 11, the bit lines connected to the node 11 ′ and other than the bit line selection transistor D1 also undergo a stress test. The voltage applied to the bit line becomes insufficient.
- a defective bit line with a leak path to the ground potential can be detected by a test, and replaced with a normal column using the redundancy function.
- the data retention characteristics on the drain side Insufficient stress in stress testing during stress testing may result in the failure of any defective cells that pass and remain undetected. For this reason, EPR0M, which has a leak path to the ground potential, was rejected despite being able to be remedied using the column redundancy function.
- the above problems also occur when performing burn-in tests on DRAM and the like. That is, in the burn-in test, a potential higher than a normal power supply potential is applied to the lead line. At this time, a high electric field is applied to the gate of each memory cell, and the gate oxide film having a withstand voltage is destroyed. Then, the word line to which the memory cell whose gate oxide film has been broken is connected is thereafter replaced with a word line for redundancy. However, when performing this burn-in test, a high potential supplied from one external terminal is applied in parallel to all the lead lines.
- the burn-in test will apply the same voltage to all lead wires as in the stress test described above.
- the stress may be at an insufficient level and lead to pass-through of the burn-in test.
- EPROM if any one of all bit lines has a defective bit line that has a leak path to the ground potential, the stress applied to all bit lines will be at an insufficient level. However, even if the reliability of data storage on the drain side of the memory cell is not sufficient, some cells may pass the stress test and may be rescued using the redundancy function. Nevertheless, there is a problem that it is regarded as a defective product.
- a first object of the present invention is to perform a stress test on a data retention reliability check on the drain side of a memory cell, even if a certain bit line is defective, or other normal bit lines, or A normal stress potential is applied to a normal bit line other than the block including the bit defect to provide a semiconductor memory capable of performing a correct reliability check. That is.
- a second object of the present invention is to perform a burn-in test for checking the withstand voltage of a gate oxide film of a memory cell, and even if a certain lead line is not present, the other normal word lines are not subjected to
- An object of the present invention is to provide a semiconductor memory in which a regular high turtle is applied and a burn-in test can be performed correctly.
- a semiconductor memory includes: a memory cell array in which memory cells are arranged at respective intersections of a plurality of first wirings and a plurality of second wirings; and a semiconductor memory connected to the plurality of second wirings.
- Selecting means for selecting the plurality of second wirings; connecting to the plurality of second wirings via the selecting means;
- a potential supply means for applying a predetermined potential to the wiring, at least one redundancy wiring used in place of the defective second wiring when the second wiring has a defect, and the redundancy
- a redundancy selecting means for selecting the redundancy wiring when using the wiring; and a defective address for storing an address for replacing the redundancy wiring with the second wiring when using the redundancy wiring.
- Storage means and when selecting the plurality of second wirings by the selecting means, selecting the second wiring except for the second wiring whose address is stored in the defective address storage means.
- control means for controlling the selection means.
- the semiconductor memory according to the present invention includes a first wiring, a plurality of memory cells driven by a signal of the first wiring, and a plurality of memory cells connected to each of the plurality of memory cells.
- FIG. 1 is a circuit diagram showing a part of a conventional EPR0M
- FIG. 2 is a circuit diagram showing a part of an EPR0M having a defective bit line having a current leak path to the ground potential
- FIG. 3 is a block diagram showing a schematic configuration of the EPR OM according to the first embodiment of the present invention
- FIG. 4 is a circuit diagram showing a specific configuration of a part of the EPR OM in FIG. 3
- FIG. 6 is a circuit diagram showing a specific configuration of a part of EPR0M in FIG. 3
- FIG. 8 is a block diagram showing a schematic configuration of the EPR0M according to the embodiment
- FIG. 8 is a circuit diagram showing a schematic configuration of the DRAM according to the third embodiment of the present invention
- FIG. 3 A circuit diagram showing a schematic configuration of the EPR OM according to the embodiment
- FIG. 10 is a circuit diagram showing a specific configuration of a part of the EPR OM of FIG. 9, and
- FIG. 11 is an EPR of FIG.
- FIG. 14 is a circuit diagram showing a schematic configuration of an EPR OM according to a fourth embodiment of the present invention
- FIG. 15 is a circuit diagram showing a schematic configuration of an EPR OM according to a fifth embodiment of the present invention. It is. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 3 is a block diagram showing a partial configuration of the EPROM according to the first embodiment of the present invention.
- 20 is a memo This is a memory cell array in which a plurality of recells M are provided, and the plurality of memory cells M are arranged in a matrix.
- a plurality of read lines WL1 to WLm and a plurality of bit lines BLl to BLn are provided so as to be orthogonal to each other, and these word lines WLl to WLm and Each of the memory cells M is arranged at each intersection with the pit lines BL1 to BLn.
- the plurality of bit lines B L1 to B Ln are connected to a bit line selection circuit 21.
- the bit line selection circuit 21 selects the plurality of bit lines BL1 to BLn.
- Reference numeral 22 denotes a potential supply circuit for generating a write potential to be supplied to each of the plurality of bit lines BLl to BLn.
- the potential supply circuit 22 is connected to the bit line selection circuit 21 via the bit line selection circuit 21. It is connected to a plurality of bit lines BLl to BLn.
- Reference numeral 23 denotes a resource having a plurality of redundancy bit lines BLR1 to BLRi which are used in place of the defective bit line when a defective one of the plurality of bit lines BL1 to BLn exists.
- This is a memory cell array for redundancy.
- a plurality of redundancy memory cells M are provided in the redundancy memory cell array 23, and the plurality of memory cells M are composed of the above-mentioned lead lines WL1 to WLm and the above-mentioned redundancy one-bit line BLR l to BLR i is arranged at each of the intersections orthogonal to each other.
- the plurality of redundancy bit lines BLR1 to BLRi are connected to the potential supply circuit 22 via a redundancy selection circuit 24.
- the above-mentioned reducer The redundancy selection circuit 24 selects the plurality of redundancy bit lines BLR1 to BLRi.
- Reference numeral 25 indicates a case where a defective bit line including a defective bit line having a leak path to the ground potential is present among a plurality of bit lines in the memory cell array 20 described above.
- This is a defective address storage circuit in which the stored address is stored.
- the storage of addresses in the defective address storage circuit 25 is performed, for example, by providing a plurality of polysilicon fuses and selectively cutting these plurality of fuses according to input data, or by storing a plurality of EPR0M cells. This is performed by a data write operation to these nonvolatile memory cells, for example, EPROM cells.
- the defective address storage circuit 25 is connected to the control circuit 26.
- the control circuit 26 includes, in addition to the addresses stored in the defective address storage circuit 25, an address signal input when selecting the plurality of bit lines BLl to BLn, and a memory cell address.
- a test mode signal is supplied to set a test mode for performing a reliability test to know the data retention characteristics on the drain side.
- the output from the control circuit 26 is supplied to the bit line selection circuit 21 and the redundancy selection circuit 24, and the selection operation of both circuits 21.24 is controlled in accordance with the output from the control circuit 26. You.
- FIG. 4 shows a detailed configuration of the memory cell array 20, the bit line selection circuit 21, and the potential supply circuit 22 in the EPR0M of FIG. Provided in the memory cell array 20
- each of the plurality of memory cells M is configured by a MOS transistor having a double gate structure including a floating gate and a control gate.
- the drain of each memory cell M is connected to any one of the plurality of bit lines BLl to BLn, and the control gate is connected to any one of the plurality of word lines WL1 to WLm.
- the drain is connected in parallel to a node supplied with a constant potential, for example, a ground potential.
- the bit line selection circuit 21 is provided with a number of bit line selection transistors HI to Hn corresponding to the bit lines BL1 to BLn. Sources of these bit line selection transistors Hl to Hn are commonly connected, and this common source is connected to the potential supply circuit 22. The drains of the transistors HI to Hn are connected to the bit lines BL1 to BLn. The plurality of outputs of the control circuit 26 are supplied to the gates of the transistors H1 to Hn for selecting the bit lines.
- the potential supply circuit 22 is composed of a transistor S.
- the source of the transistor S is connected to the high potential VPP for writing, and the drain is connected to the common source of the transistors H1 to Hn in the bit line selection circuit 21.
- the gate of the transistor S is supplied with the high potential VPP during the test mode.
- Specific element structure when the transistor for each memory cell provided in the memory cell array 20 is an N-channel type.
- the structure is shown in FIG. In FIG. 5, a source region 31 and a drain region 32 made of an N + -type diffusion region are formed in a surface region of a P-type semiconductor substrate 30.
- a floating gate 35 is provided above a channel region 33 existing between the source region 31 and the drain region 32 via a gate insulating film 34.
- a control gate 37 is provided above the floating gate 35 via a gate insulating film 36.
- a protective insulating film 38 is formed on the surface of the substrate including the double gate structure as described above.
- FIG. 6 shows the details of a part of the internal configuration of the control circuit 26 together with the bit line selection circuit 21 described above.
- the control circuit 26 illustrates a case where four bit lines are provided in the memory cell array 20, that is, a case where the number of ⁇ is four. Therefore, in this case, four pit line selection transistors HI to H4 are provided in the pit line selection circuit 21.
- the control circuit 26 is provided with a column decoder 27 and a test column decoder 28. Further, in the column decoder 27, four 3-input AND gates 41 to 44 are provided corresponding to the four bit line selecting transistors HI to H4.
- the outputs of the four AND gates 41 to 44 are supplied to the respective gates of the four bit line selection transistors HI to H4 in the bit line selection circuit 21.
- Each of the four AND gates 41 to 44 has a 2-bit column address.
- the test signal and the output of the test column decoder 28 are supplied.
- the AND gate 41 for driving the gate of the transistor H1 for selecting the bit line has a two-bit bit address signal A0 and A1 and a test column decoder 28. Output is provided.
- the AND gate 42 is supplied with a 2-bit bit address signal consisting of ZA0 and A1 and the output of the test column decoder 28.
- the AND gate 43 is supplied with a 2-bit address signal consisting of A0 and / A1 and the output of the test column decoder 28. Further, the AND gate 44 is supplied with a 2-bit bit address signal consisting of ZA0 and ZA1 and the output of the test column decoder 28. The bit address signal of each of these two bits is set to a logic level according to a column address signal input from the outside in a normal data read and write mode. All are set to logic "1" in the test mode for performing the stress test.
- test column decoder 28 four 2-input NAND gates 45 to 48 are provided corresponding to the four bit line selecting transistors HI to H4.
- the address stored in the defective address storage circuit 25 is supplied as a 2-bit signal. That is, F0 and F1 forces for NAND gate 45, F0 and F1 for NAND gate 46, F0 and / F1 forces for NAND gate 47, and Is supplied with F 0 and / F 1 respectively.
- the control circuit 26 receives a column address signal for selecting a specific bit line in the memory cell array 20 in which a defect has occurred during a normal data write operation and a data read operation.
- the redundancy selection circuit 24 is controlled so that one of the redundancy bit lines BLR 1 to BLR i in the redundancy memory cell array 23 is selected in place of the defective bit line. It has a function. However, since the redundancy function in the normal operation mode at the time of data reading and Z writing is well known, the configuration of that part is omitted.
- a defective bit line having a leak path to the ground potential may exist among a plurality of bit lines in the memory cell array 20 before the stress test is performed. If so, the address corresponding to the defective bit line is stored in the defective address storage circuit 25. For example, in FIG. 3, if a leak path occurs on the bit line BL 1, the address corresponding to the bit line BL 1 is stored in the defective address storage circuit 25.
- the test mode signal supplied to the control circuit 26 is set to the test state in order to perform the drain stress test, the drain stress test is started. At this time, of the 2-bit signal output from the defective address storage circuit 25, F0 and F1 of the address corresponding to the defective bit line BL1 are both set to "1".
- the output power of the NAND gate 45 receiving the bit signal is “0”.
- the other three NAND gates 45 to 48 in the test At least one of the two-bit signals input to the gate is "0", and the outputs of these three NAND gates 45 to 48 are all "1".
- the pit address signals A0, ZA0, A1, and ⁇ A1 are all set to "1", so that four AND gates in the column decoder 27 are set.
- the gates 41 to 44 only the output of the AND gate 41 becomes "0", and the outputs of the remaining AND gates 42 to 44 all become "1".
- the transistor H 1 connected to the defective bit line BL 1 is turned off, and the failure is reduced.
- Transistors H2 to H4 connected to the remaining three bit lines BL2 to BL that have not been generated turn on.
- the high potential VPP is supplied to the source and the gate of the transistor S in the potential supply circuit 22, the high potential VPP is applied to the defective bit line BL1.
- the stress stress can be applied to the other bit lines without applying the stress stress to the defective bit line.
- the drain stress is also applied to the redundancy bit lines BLR1 to BLRi in the redundancy memory cell array 23. Applied.
- the output of the AND gate 41 in the column decoder 27 becomes “0” and the defective bit line BL 1 can be selected. Absent. Further, instead of the defective bit line BL1, one of the redundancy bits and the lines BLR1 to BLRi in the redundancy memory cell array 23 is selected.
- FIG. 7 is a block diagram showing a partial configuration of an EPROM according to a second embodiment of the present invention.
- the point that the EPR 0 M of this embodiment is different from that of the first embodiment shown in FIG. 3 is that the signals FO, ZF 0, F l, without the defective address storage circuit 25 are provided.
- the configuration is such that ZF 1 and the like are supplied to the control circuit 26 from outside the memory.
- the control circuit 26 has a built-in latch circuit 27 for latching these signals.
- FIG. 8 is a block diagram showing a configuration of a third embodiment of the present invention in which the present invention is applied to a DRAM.
- reference numeral 50 denotes a memory cell array in which a plurality of dynamic memory cells M are provided, and the plurality of memory cells M are arranged in a matrix.
- a plurality of connection lines for example, four connection lines WL1 to WL4 and a plurality of bit lines BL1 to BLn are provided so as to be orthogonal to each other.
- Each of the memory cells M is arranged at each intersection of the word lines WL1 to WL4 and the bit lines BL1 to BLn.
- the above four lead wires WL1 to WL4 are lead wire selection circuits.
- the word line selection circuit 51 selects the above four word lines WL1 to WL4.
- Reference numeral 52 denotes a potential supply terminal to which a high potential VPP for supplying to each of the plurality of lead lines WL1 to WL4 during the burn-in test is supplied.
- the circuit is connected to the four lead lines WL1 to WL4 via a circuit 51.
- Reference numeral 53 denotes a plurality of redundancy lead lines used in place of the defective word line when there is a defect among the four lead lines WL1 to WL4, for example, two redundancy lines. It is a memory cell array for redundancy with a redundancy lead line WLR1 and WLR2.
- a plurality of redundancy memory cells M are provided in the redundancy memory cell array 53, and the plurality of memory cells M are composed of the above-mentioned lead lines WLR1, WLR2 and the above-mentioned bit lines BLl to BL. n is arranged at each of the intersections orthogonal to each other.
- the plurality of redundancy word lines WLR1 and WLR2 are connected to the potential supply terminal 52 via a redundancy selection circuit 54.
- the redundancy selection circuit 54 selects the plurality of redundancy guide lines WL R1 and WL R2.
- Reference numeral 55 denotes a case in which, among the four lead lines in the memory cell array 50, there is a defective lead line having a leak path with respect to the ground potential, and an address corresponding to the defective lead line is provided. This is a defective address storage circuit to be stored.
- the memory of the address in the defective address storage circuit 55 is, for example, a case in which a plurality of fuses are used. This is performed by selectively cutting a plurality of fuses according to input data.
- the defective address memory circuit 55 is connected to the control circuit 56.
- the control circuit 56 receives a test mode signal for setting a test mode for performing a burn-in test in addition to the address stored in the defective address storage circuit 55. Entered from 5 7.
- the output from the control circuit 56 is supplied to the above-mentioned mode line selection circuit 51 and the redundancy selection circuit 54, and the selection operation of both circuits 51 and 54 is performed according to the output from the control circuit 56. Controlled.
- Reference numeral 58 denotes a row decoder for selecting the above four lead lines WL1 to WL4 during a normal data write operation or data read operation
- reference numeral 59 denotes a row decoder when the redundancy function is used. Redundancy row line This is a row decoder for redundancy that selects WLR 1 or WLR 2.
- the lead line selection circuit 51 four lead line selecting transistors W1 to W4 corresponding to the lead lines WL1 to WL4 are provided.
- the sources of the transistor W1 to W4 for selecting the line are connected in common, and this common source is connected to the potential supply terminal 52.
- the drains of the transistors W1 to W4 are connected to the first lead lines WL1 to WL4, respectively.
- a plurality of outputs of the control circuit 56 are supplied to the gates of the transistors W1 to W4 for selecting the line.
- Transistors for selecting the above four lead lines are provided in the control circuit 56.
- Four 3-input NAND gates 61 to 64 are provided corresponding to the masters W1 to W4.
- the address stored in the defective address storage circuit 55 is supplied as a 2-bit signal, and the test mode signal is supplied. . That is, F0, F1 and the test mode signal are supplied to the NAND gate 61.
- the NAND gate 62 is supplied with ZF0, F1 and a test mode signal.
- the NAND gate 63 is supplied with F0, ZF1 and a test mode signal.
- the NAND gate 64 is supplied with ZF0, / F1 and a test mode signal.
- a defective word line having a leak path to the ground potential may exist in a plurality of word lines in the memory cell array 50 in advance.
- an address corresponding to the defective mode line is stored in the defective address storage circuit 55.
- the address corresponding to the lead line WL1 is stored in the defective address storage circuit 55.
- the high potential VPP is supplied to the potential supply terminal 52, so that the high potential VPP is the remaining three lead lines WL2 except for the defective lead line WL1. ⁇ Supplied to BL4.
- the stress potential can be applied to the other word lines without applying the stress potential to the defective lead line during the burn-in test.
- the stress potential is also applied to the redundancy lead lines WLR1 and WLR2 in the redundancy memory cell array 53 during the burn-in test. Applied. Also, as in the case of the embodiment of FIG. 7, even in the memory of the embodiment of FIG. 8, the signals F 0, ZF 0, F l, / F are provided without providing the defective address storage circuit 55. 1 may be supplied to the control circuit 56 from outside the memory.
- FIG. 9 is a circuit diagram showing a configuration of the bit line selection circuit 21 in FIG. 3 in the EPR0M according to the fourth embodiment of the present invention.
- the bit line selection circuit 21 This is a case with a multi-stage structure, and for simplicity of explanation, a total of 16 bit lines AO ⁇ A3, B0 ⁇ B 3, CC! ⁇ C 3, DC!
- the transistor D r is shown. It is also assumed that there is one defective bit line having a leak path to the ground potential.
- the bit line to which the drain stress is applied is indicated by ⁇ , and the bit line to which the drain stress is not applied is indicated by X.
- the memory cell array 20, the dummy memory cell array 23, the redundancy selection circuit 24, the defective address storage circuit 25, and the control circuit 26 are also provided in the same manner as in the embodiment shown in FIG. It is provided.
- the stress potential can be applied to the other bit lines without applying the drain stress to the defective bit line by the above-described method. It can be seen that one stress can be applied to each bit line without duplication. The same effect can be expected even if the column decoder outputs di and hi are exchanged in the above sequence.
- FIGS. 10 and 11 are circuit diagrams each showing a detailed configuration of a part of the control circuit 26 used in the circuit of the embodiment shown in FIG.
- EPR0M having the redundancy function
- an address corresponding to the bit line having a defect is stored in the defective address storage circuit 25.
- the column decode outputs d i and h i to be set to “0” can be made from this storage address.
- FIGS. 10 and 11 show examples of the configuration of a control circuit for realizing this. The truth values of the output signals with respect to the input signals of the two circuits are shown in FIGS. 12 and 13, respectively.
- FIG. 10 shows a configuration of a portion of the control circuit 26 for obtaining a column decode output h0.
- This circuit includes a test circuit 61 and a column decode circuit 62. Therefore, in the circuit of the embodiment shown in FIG. 9, four circuits as shown in FIG. 10 are provided in the control circuit 26 in total.
- FIG. 11 shows a configuration of a part of the control circuit 26 for obtaining a column decode output d0.
- This circuit includes a test circuit 63 and a column decode circuit 64. Therefore, in the circuit of the embodiment shown in FIG. 9, the control circuit 26 shown in FIG. There are four such circuits in total.
- test mode signals two types are used as test mode signals for setting the EPR0M in the drain stress test.
- One type is A1 2> and A1 3>.
- a 1 2> and A 1 3> are ternary control inputs to input or output pins that are not used in the drain stress test mode, i.e., high potential in test mode, At this time, a signal of 0 V to 5 V is given, and a signal output by detecting this by a ternary input detection circuit inside the chip is used. That is, when a high potential of, for example, 12 V is applied to each of the address input terminals A 12 and A 13, A 12> and A 13> each become “1”.
- the other one of the test mode signals is a signal SPEC.
- This signal SPEC is a signal indicating whether or not the redundancy function is used, and the signal SPEC is "1" when the redundancy function is used.
- This signal SPEC may be input from the outside of the chip as a ternary control input as in the case of A12 and ⁇ A13> as described above. Alternatively, the information may be stored in advance.
- A0 to A3 are column address signals, and these signals are inverted signals corresponding to the corresponding circuits. Is entered.
- a test circuit 61 for outputting h1 receives ZF0 and F1 as signals based on fuse data, and a column decode circuit 62 generates a column address signal.
- ZA 0 and A 1 are input.
- the signal based on the fuse data is, for example, "1" when the corresponding fuse is disconnected.
- Each of the test circuits 61 is configured as follows. That is, a signal F 0 (or its inverted signal) and F 1 (or its inverted signal) based on the fuse data are input to the NAND gate 71 and the NAND gate 71 is connected to the NAND gate 71. Is input to the exclusive NOR gate 72. Also, the signal A 13> is input to the exclusive N 0 R gate 72. In addition, the above signals A 1 2> and A 1 3> are input to the OR gate 73. The output of the exclusive NOR gate 72 and the output of the OR gate 73 are input to the NAND gate 74 together with the signal SPEC.
- each of the column decoding circuits 62 is constituted by an AND gate 75, and the AND gate 75 has a column address signal A0 (or an inverted signal thereof), A1 (or an inverted signal). Is an inverted signal thereof) and the output of each test circuit 61 described above.
- Each of the test circuits 63 is formed as follows. That is, the signal F2 (or its inverted signal) and F3 (or its inverted signal) based on the fuse data are input to the NAND gate 76, and this NAND gate The output of 76 is input to OR gate 77.
- the signal SPEC is input to the OR gate 77 via an inverter 78.
- the signal SPEC is also input to the 0R gate 79.
- More signals A 13> is input to the OR gates 77 and 79 via the inverter 80.
- the outputs of the two OR gates 77 and 79 are input to the AND gate 81.
- each of the column decoding circuits 64 is composed of an AND gate 82, and the AND gate 82 has a column address signal A2 (or its inverted signal), A3 (or an inverted signal). The inverted signal) and the output of each of the test circuits 63 are input.
- the column decode outputs di are all “1”
- the column decode output hi is "0” when the output of the NAND gate 71 is "0" (corresponding to a defective bit line).
- the column decode output di is “0” when the output of NAND gate 76 is “0” (corresponding to a defective bit line), and “1” (corresponding to a normal bit line). ) Becomes “1”, and the column decode output hi becomes “1” when the output of NAND gate 71 is “0” (corresponding to the defective bit line),
- the output of the column decode hi is always "1"
- the output of the column decode di can be controlled by the ternary control detection signal A13>.
- FIG. 14 shows an example of a circuit configured to apply a stress potential to a block having only the G line.
- S0 to S3 are write transistors to which write data SDi is given, and the other components are the same as those in FIG. And O
- This circuit does not need to consider the column decode output h i because the bit line group selected by the column decode output d i is handled in block units. Blocks with bad bit lines are repaired by a redundancy block.
- Blocks are different but selected by the same column decoded output h i.
- Blocks are different and are selected by different column decode outputs hi.
- FIG. 15 shows a circuit example of the sixth embodiment which is effective in the case of the above (c).
- This circuit inputs a "0", "1" (or “1", "0") signal for the first time to the column decode output (di, hi) corresponding to the defective bit line.
- the second time if the signal of "1", "0" (or "0", "1") is input, without applying the stress voltage to the defective bit line, the normal bit line A stress test can be performed.
- the signal can be input by the same algorithm based on the data of two column redundancy, and only two tests are required.
- the stress test can be performed in the same manner.
- the test mode setting can be extended from the case of one defective bit line.
- the positions of the bit lines rescued by each cell block in the chip are all the same, but the positions of the bit lines rescued by the redundancy can be changed independently for each block. By doing so, the remedy rate of randomly generated defects can be improved. If this method is combined with the circuit of the fourth embodiment or the circuit of the fifth embodiment, a stress potential can be applied independently for each block. Industrial applicability
- the present invention in a stress test of the data retention reliability check on the drain side of a memory cell of EPR0M, even if a defect exists in a certain bit line, The normal stress potential is applied to the normal bit line or the normal bit line other than the block containing the defective bit, and the correct reliability check is performed.
- a semiconductor memory that can be realized can be realized.
- the degree of integration of semiconductor integrated circuits has become increasingly higher, and with the miniaturization, wiring-related defects have been increasing. If there is a defective bit line that has a current leak path to the ground potential used in the present invention, it is conventionally possible to apply a sufficient dress potential even by performing a drain stress test.
- Such chips were treated as defective because no normal bit lines came out. Since such defects account for half of the bit line defects, it is very important to remedy these defects. Therefore, it is possible to apply the stress potential to the other normal bit lines without applying the stress potential to the defective bit line proposed in the present invention, or The stress potential can be applied to the other normal pit lines without applying the stress potential to the block including the ground line, so that a faulty bit that has a current leak path to the ground potential can be applied. It is now possible to rescue even if there is a line. In addition, by dividing the chip and independently changing the redundancy rescue position, it has become possible to compensate for the failure to deal with random defects.
- a defect when a defect is present in a certain word line during a DRAM burn-in test, a normal high potential is applied to other normal ground lines, and a correct burn-in test is performed.
- a semiconductor memory capable of performing the above can be realized.
Landscapes
- For Increasing The Reliability Of Semiconductor Memories (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019960700002U KR960007363Y1 (ko) | 1990-10-02 | 1991-10-02 | 반도체 메모리 |
DE69129492T DE69129492T2 (de) | 1990-10-02 | 1991-10-02 | Halbleiterspeicher |
KR1019920701298A KR960001307B1 (ko) | 1990-10-02 | 1991-10-02 | 메모리의 테스트방법 |
EP91917343A EP0503100B1 (en) | 1990-10-02 | 1991-10-02 | Semiconductor memory |
US07/853,729 US5430678A (en) | 1990-10-02 | 1991-10-02 | Semiconductor memory having redundant cells |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26410890 | 1990-10-02 | ||
JP2/264108 | 1990-10-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992006475A1 true WO1992006475A1 (en) | 1992-04-16 |
Family
ID=17398616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1991/001323 WO1992006475A1 (en) | 1990-10-02 | 1991-10-02 | Semiconductor memory |
Country Status (6)
Country | Link |
---|---|
US (2) | US5430678A (ja) |
EP (1) | EP0503100B1 (ja) |
JP (1) | JP2619170B2 (ja) |
KR (2) | KR960001307B1 (ja) |
DE (1) | DE69129492T2 (ja) |
WO (1) | WO1992006475A1 (ja) |
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JP2008004159A (ja) * | 2006-06-21 | 2008-01-10 | Toshiba Corp | 半導体記憶装置及びそのテスト方法 |
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US5672966A (en) * | 1992-07-23 | 1997-09-30 | Xilinx, Inc. | High speed post-programming net packing method |
JP3263259B2 (ja) * | 1994-10-04 | 2002-03-04 | 株式会社東芝 | 半導体記憶装置 |
JP3865828B2 (ja) * | 1995-11-28 | 2007-01-10 | 株式会社ルネサステクノロジ | 半導体記憶装置 |
JPH09180492A (ja) * | 1995-12-26 | 1997-07-11 | Sony Corp | 半導体記憶装置 |
US5659511A (en) * | 1996-05-06 | 1997-08-19 | United Microelectronics Corporation | Method for measuring the current leakage of a dynamic random access memory capacitive junction |
US5923601A (en) * | 1996-09-30 | 1999-07-13 | Advanced Micro Devices, Inc. | Memory array sense amplifier test and characterization |
US5764577A (en) * | 1997-04-07 | 1998-06-09 | Motorola, Inc. | Fusleless memory repair system and method of operation |
JPH10302497A (ja) * | 1997-04-28 | 1998-11-13 | Fujitsu Ltd | 不良アドレスの代替方法、半導体記憶装置、及び、半導体装置 |
JP3586591B2 (ja) * | 1999-07-01 | 2004-11-10 | シャープ株式会社 | 冗長機能を有する不揮発性半導体メモリ装置のための不良アドレスデータ記憶回路および不良アドレスデータ書き込み方法 |
JP4727785B2 (ja) * | 2000-01-26 | 2011-07-20 | 富士通セミコンダクター株式会社 | 半導体記憶装置及び半導体記憶装置のワード線欠陥検出方法 |
DE10103060B4 (de) * | 2000-01-26 | 2006-06-08 | Infineon Technologies Ag | Verfahren zum Testen einer ein Floating-Gate aufweisenden Speicherzelle und Anordnung zur Durchführung dieses Verfahrens |
US6683467B1 (en) * | 2000-09-29 | 2004-01-27 | Intel Corporation | Method and apparatus for providing rotational burn-in stress testing |
JP4007823B2 (ja) * | 2002-02-21 | 2007-11-14 | 株式会社ルネサステクノロジ | 半導体記憶装置 |
US7679978B1 (en) * | 2007-07-11 | 2010-03-16 | Sun Microsystems, Inc. | Scheme for screening weak memory cell |
US7872902B2 (en) * | 2008-08-18 | 2011-01-18 | Qimonda Ag | Integrated circuit with bit lines positioned in different planes |
US7881134B2 (en) * | 2008-11-17 | 2011-02-01 | Micron Technology, Inc. | Replacing defective columns of memory cells in response to external addresses |
US9484114B1 (en) * | 2015-07-29 | 2016-11-01 | Sandisk Technologies Llc | Decoding data using bit line defect information |
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- 1991-10-02 DE DE69129492T patent/DE69129492T2/de not_active Expired - Lifetime
- 1991-10-02 US US07/853,729 patent/US5430678A/en not_active Expired - Lifetime
- 1991-10-02 JP JP3515818A patent/JP2619170B2/ja not_active Expired - Fee Related
- 1991-10-02 KR KR1019920701298A patent/KR960001307B1/ko not_active IP Right Cessation
- 1991-10-02 WO PCT/JP1991/001323 patent/WO1992006475A1/ja active IP Right Grant
- 1991-10-02 KR KR2019960700002U patent/KR960007363Y1/ko not_active IP Right Cessation
- 1991-10-02 EP EP91917343A patent/EP0503100B1/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
EP0503100A1 (en) | 1992-09-16 |
KR960007363Y1 (ko) | 1996-08-28 |
EP0503100B1 (en) | 1998-05-27 |
EP0503100A4 (ja) | 1994-04-20 |
US5432745A (en) | 1995-07-11 |
DE69129492T2 (de) | 1998-11-05 |
JP2619170B2 (ja) | 1997-06-11 |
US5430678A (en) | 1995-07-04 |
DE69129492D1 (de) | 1998-07-02 |
KR960001307B1 (ko) | 1996-01-25 |
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