WO2007118679A1 - Schaltungsanordnung mit einer nicht-flüchtigen speicherzelle und verfahren - Google Patents
Schaltungsanordnung mit einer nicht-flüchtigen speicherzelle und verfahren Download PDFInfo
- Publication number
- WO2007118679A1 WO2007118679A1 PCT/EP2007/003270 EP2007003270W WO2007118679A1 WO 2007118679 A1 WO2007118679 A1 WO 2007118679A1 EP 2007003270 W EP2007003270 W EP 2007003270W WO 2007118679 A1 WO2007118679 A1 WO 2007118679A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inverter
- memory cell
- terminal
- volatile memory
- circuit arrangement
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
- G11C17/14—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards in which contents are determined by selectively establishing, breaking or modifying connecting links by permanently altering the state of coupling elements, e.g. PROM
Definitions
- the present invention relates to a nonvolatile memory cell circuit, a use of the circuit, and a method of operating a nonvolatile memory cell.
- Non-volatile memory cells are widely used elements for permanently storing data such as serial numbers, trim settings of analog circuits, or a number of a semiconductor body in a semiconductor body.
- Object of the present invention is to provide a circuit arrangement with a non-volatile memory cell and a method for operating a non-volatile memory cell, which ensure an accurate evaluation of the programming state of the non-volatile memory cell and a realization of the circuit arrangement with a low cost of components ,
- a circuit arrangement comprises a nonvolatile memory cell, a reference element and a comparator.
- a differential current path connects a supply voltage terminal to a reference potential terminal.
- the comparator is symmetrical and connected in the differential current path.
- the comparator has a self-holding function.
- the non-volatile memory cell is inserted into a first branch of the differential current path. switches and the reference element is connected in a second branch of the differential current path.
- the self-latching comparator includes first and second inverters.
- the first inverter couples a supply terminal of the first inverter to a reference potential terminal.
- the second inverter couples a supply terminal of the second inverter to the reference potential terminal.
- the first inverter and the second inverter each have an input and an output.
- the input of the second inverter is connected to the output of the first inverter and the output of the second inverter is connected to the input of the first inverter. Due to the different currents in the two Branches of the differential current path load up the two branches at different speeds. This difference is evaluated by the balanced comparator with a digital output signal.
- the feedback of the two inverters ensures the self-holding function of the output signal of the comparator.
- the non-volatile memory cell couples the supply voltage terminal to the supply terminal of the first inverter, and the reference element couples the supply voltage terminal to the supply terminal of the second inverter.
- the first inverter has a first and a second transistor and the second inverter also has a first and a second transistor.
- a first charging transistor couples the output of the first inverter to the reference potential terminal
- a second charging transistor couples the output of the second inverter to the reference potential terminal.
- the first and the second charging transistor are connected to each other at a control terminal. If the first and the second charging transistor are turned on, then the output of the first inverter and the output of the second inverter are at a low potential, approximately the reference potential. If, in a following step, the first and the second charging transistor are simultaneously switched off, the non-volatile memory cell and the reference element charge the outputs of the two inverters.
- the nonvolatile memory cell has a higher resistance compared to the reference element, a potential at the output of the second inverter increases faster than a potential at the output of the first inverter. If the switching threshold of the second inverter is reached, it is at the Output of the second inverter can be tapped off a high potential. Due to the connection of the output of the second inverter to the input of the first inverter, the first inverter is driven so that it provides a low potential at its output. The reverse is true in the case where the nonvolatile memory cell has a lower resistance compared to the reference element.
- the circuitry includes a write arrangement having a first switch connecting a first input of the write array to the output of the first inverter, a second switch connecting a second input of the write array to the output of the second inverter, and a control input is connected to a control terminal of the first switch and a control terminal of the second switch.
- the non-volatile memory cell may be a mask-programmed memory cell.
- the nonvolatile memory cell may comprise a reversibly programmable memory cell.
- the non-volatile memory cell can be realized as an irreversibly programmable memory cell.
- the non-volatile memory cell may be realized as a resistor, wherein a programming current irreversibly increases the resistance value of the non-volatile memory cell.
- the non-volatile memory cell may be a fuse, English Fuse, which is programmed by means of a laser beam.
- the non-volatile memory cell is realized as a fuse, English fuse, comprising a resistor which can be fused by means of a programming current.
- the non-volatile memory cell may be a metal resistance, a polysilicon resistor or a combined polysilicon / silicide resistor.
- the non-volatile memory cell can be realized as an antifuse element, wherein the resistance value can be reduced irreversibly by means of a programming current.
- the antifuse element can be realized as a diode, in particular as a Zener diode.
- the reference element may be realized as a resistor having a resistance value which is preferably between the resistance values of the non-volatile memory cell before and after the programming.
- the circuit arrangement may comprise a programming transistor connected between a terminal of the non-volatile memory cell and the reference potential terminal. Another connection of the non-volatile memory cell is connected to the supply voltage connection.
- the programming transistor When the programming transistor is turned on, a high current flows through the nonvolatile memory cell and sets a resistance of the nonvolatile memory cell, so that the nonvolatile memory cell is programmed.
- the circuit arrangement has a compensation element, which is connected to a terminal of the reference element and is coupled to the second branch of the differential current path.
- the compensation element serves to compensate for the capacitive load caused by the programming transistor in the first branch of the differential current path.
- the capacitive and resistive loads in the first and second branches of the current path are approximately equal except for the resistance values of the nonvolatile memory cell and the reference element.
- the circuit arrangement can be formed on a semiconductor body.
- the circuit arrangement can be implemented in a bipolar integration technique and comprise transistors which are designed as bipolar transistors.
- it can be produced by means of a complementary metal-oxide semiconduc tor integration technique and have transistors which are realized as field-effect transistors.
- the circuitry can be used for permanent storage of data.
- the data may include a serial number or an identification number for the semiconductor body.
- the circuit arrangement for storing a trim setting of an analog circuit in particular an analog / digital or a digital / analog converter, may be provided. It can be used to repair a Random Access Memory, abbreviated RAM, by turning on redundant rows or columns instead of broken rows or columns.
- a method for operating a non-volatile memory cell comprises the following steps: A supply voltage is provided. An output signal and an inverted output signal are set in accordance with a resistance value of a nonvolatile memory cell and a resistance value of a reference element, and held. In this case, the non-volatile memory cell is connected in a first branch and the reference element in a second branch of a differential current path. The differential current path flows through a comparator.
- the comparator and the reference element ensure accurate readout of the information stored in the non-volatile memory cell.
- FIG. 1 shows an exemplary embodiment of a circuit arrangement with a non-volatile memory cell according to the proposed principle
- FIG. 2 shows an exemplary development of the invention
- Figures 3A to 3C show an exemplary embodiment of a non-volatile memory cell which is formed as a fuse
- Figure 4 shows an exemplary embodiment of a non-volatile memory cell, which is realized as an antifuse.
- Figure 1 shows an exemplary embodiment of a circuit arrangement with a non-volatile memory cell 10 according to the proposed principle.
- the circuit arrangement has a first branch 35 and a second branch 55, which are connected between a supply voltage terminal 9 and a reference potential terminal 8.
- the first and second branches 35, 55 together form a differential current path of a comparator 3.
- the comparator 3 has a first inverter 11 and a second inverter 21.
- the first inverter 11 is in the first branch 35 and the second one
- Inverter 21 is disposed in the second branch 55.
- the first inverter 11 is connected between a supply terminal 12 of the first inverter 11 and the reference potential terminal 8 and has a first transistor 30 and a second transistor 40, which are connected to each other in series.
- the transistors 30, 40 are connected on the input side to an input 14 of the first inverter 11.
- a tap between the first and second transistors 30, 40 of the first inverter 11 forms an output 15 of the first inverter 11.
- the second inverter 21 has a first transistor 50 and a second transistor 60 connected between a supply terminal 22 of the first inverter second inverter 21 and the reference potential terminal 8 are connected.
- the two transistors 50, 60 of the second inverter 21 are connected on the input side to an input 24 of the second inverter 21.
- a node between the first and second transistors 50, 60 of the second inverter 21 serves as the output 25 of the second inverter 21.
- the output 15 of the first inverter 11 is connected to the input 24 of the second inverter 21 and the output 25 of the second inverter 21 with the entrance
- the output 15 of the first inverter 11 is connected via a first charging transistor 70 and the output 25 of the second inverter 21 is connected via a second charging transistor 70.
- Charging transistor 80 coupled to the reference potential terminal 8. The first and the second charging transistor 70, 80 are connected to each other on the input side.
- a supply voltage VDD is connected.
- the control terminals of the first and the second charging transistor 70, 80, a charging signal LOAD can be fed.
- the first and the second charging transistor 70, 80 are turned on in a first operating state.
- the first transistor 30 and the first transistor 50 of the first and second inverters 11, 21 are turned on and the second transistor 40 and the second transistor 60 of the first and second inverters 11, 21 are turned off.
- different currents II, 12 occur in the two branches 35, 55 of the differential current path, which currents cause different voltage potentials at the supply terminals 12 and 22.
- the comparator 3 detects the voltage difference between the two supply terminals 12, 22 and stores the result in the two inverters 11, 21 in a self-sustaining manner.
- the inverted output voltage NVOUT increases faster than the output voltage VOUT, so that due to the feedback of the first and second inverters 11, 21, the second transistor 60 of the second inverter 21 and the first transistor 30 of the first inverter 11 conductive and the other two transistors 50, 40 are connected as a barrier.
- At the output 15 of the first inverter 11 is an inverted output signal NVOUT and at the output 25 of the second inverter 21 an output signal VOUT can be tapped.
- a state of the non-volatile memory cell 10 can thus be detected with few components and the output signal VOUT held.
- Figure 2 shows an exemplary development of the embodiment of a circuit arrangement shown in Figure 1 with a non-volatile memory cell.
- the circuit arrangement in FIG. 2 has a programming transistor 150, which connects the supply terminal 12 of the first inverter 11 to the reference potential terminal 8.
- a compensation element 160 is connected to the supply terminal 22 of the second inverter 21.
- the compensation element 160 is designed as a transistor.
- a first buffer 135 is connected to the output 15 of the first inverter 11, and a second buffer 115 is connected to the output 25 of the second inverter 21.
- the first buffer 135 has an inverter, comprising a first and a second transistor 140, 130, which is connected between the supply voltage terminal 9 and the reference potential terminal 8.
- the second buffer 115 has an inverter, comprising a transistor 120 and a transistor 110, which is connected between the reference potential terminal 8 and the supply voltage terminal 9.
- the inputs of the two transistors 130, 140 of the first buffer 135 are connected to the output 15 of the first inverter 11 and the inputs of the transistors 120, 110 of the second buffer 115 to the output 25 of the second inverter 21.
- the output 15 of the first inverter 11 is preceded by a first switch 100 of a writing arrangement 89.
- a second switch 90 of the write assembly 89 is connected upstream.
- the control terminals of the first and second switches 90, 100 are linked together and to a control input 92 of the write arrangement 89.
- the transistors 30, 40, 50, 60, 70, 80, 110, 120, 130, 140, 150, 160 and the switches 90, 100 can be realized as field-effect transistors, in particular as metal-oxide-semiconductor field-effect transistors, abbreviated MOSFETs.
- the programming transistor 150 serves to provide a first current Il having a high current value flowing through the nonvolatile memory cell 10 to perform a program operation. Due to its size, the programming transistor 150 represents a capacitive load at the supply terminal 12.
- the two branches 35, 55 of the differential current path are advantageously capacitively loaded in the same way in order to ensure a symmetrical design of the comparator 3.
- the supply connection 22 of the second inverter 21 is connected to the compensation element 160.
- This compensation element 160 is designed as a transistor and represents the same capacitive load for the second branch 55 of the differential current path as the programming transistor 150 for the first branch 35 of the differential current path.
- a buffer 115, 135 is connected downstream of the two outputs 15, 25 of the first and second inverters 11, 21, so that a capacitive load is present at the output 15 of the first inverter 11 and a capacitive load at the output 25 of the second inverter 21 are approximately equal and can not be changed by circuits not shown in Figure 2, which are the output side of the first and second inverters 11, 21 downstream.
- downstream circuits do not affect the setting and switching operation of the first and second inverters 11, 21.
- the first and second branches 35, 55 are constructed symmetrically except for the non-volatile memory cell 10 and the reference element 20.
- the loading of the outputs 15, 25 by the first and second buffers 115, 135 is symmetrical.
- An influence of the programming transistor 150 on the first branch 35 is compensated by the influence of the compensation element 160 on the second branch 55.
- the output signals VOUT, NVOUT can advantageously depend solely on the state of the non-volatile memory cell 10 and of the reference element 20 due to the symmetrical structure of the circuit arrangement.
- the output signal VOUT with the value of a setting signal DATAIN and the inverted output signal NVOUT with the value of the inverted setting signal NDATAIN can be provided as soon as the two switches 90, 100 are turned on by means of a write control signal WRITE.
- the buffered output voltages DATAOUT, NDATAOUT can be set by means of the write arrangement 89. For example, a circuit using the buffered output voltages
- DATAOUT, NDATAOUT are set and tested first before the setting is committed by the programming operation of the nonvolatile memory cell 10.
- Such a circuit may be, for example, a bandgap reference circuit.
- the buffered output voltages DATAOUT, NDATAOUT can also be set after the program operation of the non-volatile memory cell 10 and thus the information of the non-volatile memory cell 10 can be overwritten. As a result, for example, an area of a memory blocked by the circuit arrangement can be made accessible again.
- the nonvolatile memory cell 10 is programmable by means of a laser beam, then in an alternative embodiment the programming transistor 150 and the compensation element 160 can be dispensed with.
- a programming terminal 170 shown in dashed lines may be connected to the supply terminal 12 of the first inverter 11 instead of the programming transistor 150.
- the programming port 170 may be formed as externally contactable port, English ped. If a voltage below the supply voltage VDD is applied to the programming terminal 170, the first current Il can flow with a high value. SEN. By this current Il programming of the nonvolatile memory cell 10 is possible.
- Figures 3A to 3C show an exemplary embodiment of a non-volatile memory cell 10 which is formed as a fuse.
- the nonvolatile memory cell 10 is realized as a polyfuse.
- FIG. 3A shows an exemplary plan view of the nonvolatile memory cell 10. It comprises a middle region 200 and a first and a second connection 201, 202, which are connected to one another via the middle region 200.
- the first and second terminals 201, 202 each have a plurality of contacts 203.
- FIG. 3B shows a cross section of the non-volatile memory cell 10, the position of which is shown in FIG. 3A.
- the non-volatile memory cell 10 is arranged on an insulator layer 205, which in turn is realized on a carrier 204.
- the middle region 200 has a double layer of a polysilicon layer 206 and a silicide layer 207.
- the polysilicon layer 206 is deposited on the insulator 205 and the silicide layer 207 on the polysilicon layer 206.
- the contacts 203 are connected to the SiIi zid layer 207.
- the nonvolatile memory cell 10 is shown prior to the programming process.
- FIG. 3C shows the non-volatile memory cell 10 after a programming operation with a sufficiently large value of the programming current.
- the silicon material 207 is arranged above all at the first connection 201.
- the original polysilicon layer 206 and the silicide layer 207 have segregated.
- the rest forms an a polymorphic silicon layer 208 which has mixed with the insulator 205 and the insulator layer 209.
- the nonvolatile memory cell 10 according to FIG. 3C has a resistance in the megohm range.
- FIG. 4 shows another exemplary embodiment of a non-volatile memory cell 10, which is designed as an antifuse and comprises a diode.
- the diode is realized as Zener diode.
- FIG. 4A shows the non-volatile storage cell 10 in a top view. This has oppositely doped regions 302, 303, which form a lateral pn junction in a contact region 300.
- the region 302 is n-doped; the region 303 is p-doped. Terminals 304, 305 are arranged on the two doped regions 302, 303.
- the non-volatile memory cell 10 is programmable by means of a first current Il. Prior to programming, the diode has a high resistance value and a comparatively low leakage current and, after programming, a low resistance value and a high current flow. In the programmed state, the diode can approximate a behavior like a resistor.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/297,082 US7995367B2 (en) | 2006-04-13 | 2007-04-12 | Circuit arrangement comprising a non-volatile memory cell and method |
GB0817674A GB2449609A (en) | 2006-04-13 | 2007-04-12 | Circuit arrangement comprising a non-volatile memory cell, and method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006017480.1 | 2006-04-13 | ||
DE102006017480A DE102006017480B4 (de) | 2006-04-13 | 2006-04-13 | Schaltungsanordnung mit einer nicht-flüchtigen Speicherzelle und Verfahren |
Publications (1)
Publication Number | Publication Date |
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WO2007118679A1 true WO2007118679A1 (de) | 2007-10-25 |
Family
ID=38358194
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/003270 WO2007118679A1 (de) | 2006-04-13 | 2007-04-12 | Schaltungsanordnung mit einer nicht-flüchtigen speicherzelle und verfahren |
Country Status (4)
Country | Link |
---|---|
US (1) | US7995367B2 (de) |
DE (1) | DE102006017480B4 (de) |
GB (1) | GB2449609A (de) |
WO (1) | WO2007118679A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8040340B2 (en) * | 2007-11-05 | 2011-10-18 | Himax Technologies Limited | Control circuit having a comparator for a bandgap circuit |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090115775A1 (en) * | 2007-11-06 | 2009-05-07 | Himax Technologies Limited | Control circuit for a bandgap circuit |
DE102008048830B4 (de) | 2008-09-25 | 2010-11-04 | Austriamicrosystems Ag | Schaltungsanordnung mit Schmelzsicherung und Verfahren zum Ermitteln eines Zustands einer Schmelzsicherung |
TWI382661B (zh) * | 2009-09-11 | 2013-01-11 | Novatek Microelectronics Corp | 開關裝置及其控制訊號產生器 |
US8654562B2 (en) * | 2012-01-17 | 2014-02-18 | Texas Instruments Incorporated | Static random access memory cell with single-sided buffer and asymmetric construction |
US9286997B2 (en) * | 2013-03-15 | 2016-03-15 | Broadcom Corporation | Read only memory array architecture and methods of operation |
US9437298B1 (en) * | 2015-03-25 | 2016-09-06 | Intel Corporation | Self-storing and self-restoring non-volatile static random access memory |
US9478308B1 (en) * | 2015-05-26 | 2016-10-25 | Intel IP Corporation | Programmable memory device sense amplifier |
CN114627945B (zh) * | 2022-05-12 | 2023-06-09 | 杭州晶华微电子股份有限公司 | eFuse存储单元和eFuse系统 |
WO2024044056A1 (en) * | 2022-08-24 | 2024-02-29 | Texas Instruments Incorporated | Ultra-low power, high speed poly fuse eprom |
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EP1195771A2 (de) * | 2000-10-05 | 2002-04-10 | Texas Instruments Incorporated | Differentielle Spannungsbewerterschaltung zum Bewerten des Zustands von CMOS-Prozess kompatiblen fuses bei niedrigen Versorgungsspannungen |
US20020057604A1 (en) * | 2000-09-15 | 2002-05-16 | Stmicroelectronics S.R.I. | Reading circuit for semiconductor non-volatile memories |
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JPS60182219A (ja) * | 1984-02-29 | 1985-09-17 | Fujitsu Ltd | 半導体装置 |
US4995004A (en) * | 1989-05-15 | 1991-02-19 | Dallas Semiconductor Corporation | RAM/ROM hybrid memory architecture |
US5334880A (en) * | 1991-04-30 | 1994-08-02 | International Business Machines Corporation | Low voltage programmable storage element |
US5418487A (en) * | 1992-09-04 | 1995-05-23 | Benchmarg Microelectronics, Inc. | Fuse state sense circuit |
US5404049A (en) * | 1993-11-02 | 1995-04-04 | International Business Machines Corporation | Fuse blow circuit |
US5731733A (en) * | 1995-09-29 | 1998-03-24 | Intel Corporation | Static, low current sensing circuit for sensing the state of a fuse device |
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US6091273A (en) * | 1997-08-19 | 2000-07-18 | International Business Machines Corporation | Voltage limiting circuit for fuse technology |
FR2787922B1 (fr) * | 1998-12-23 | 2002-06-28 | St Microelectronics Sa | Cellule memoire a programmation unique en technologie cmos |
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US6525955B1 (en) * | 2001-12-18 | 2003-02-25 | Broadcom Corporation | Memory cell with fuse element |
DE10163484A1 (de) * | 2001-12-21 | 2003-07-10 | Austriamicrosystems Ag | Zenerdiode, Zenerdiodenschaltung und Verfahren zur Herstellung einer Zenerdiode |
AU2003241719A1 (en) * | 2002-06-05 | 2003-12-22 | Matsushita Electric Industrial Co., Ltd. | Non-volatile memory circuit, drive method thereof, semiconductor device using the memory circuit |
JP4133149B2 (ja) * | 2002-09-12 | 2008-08-13 | 株式会社ルネサステクノロジ | 半導体記憶装置 |
US6819144B2 (en) * | 2003-03-06 | 2004-11-16 | Texas Instruments Incorporated | Latched sense amplifier with full range differential input voltage |
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2006
- 2006-04-13 DE DE102006017480A patent/DE102006017480B4/de not_active Expired - Fee Related
-
2007
- 2007-04-12 WO PCT/EP2007/003270 patent/WO2007118679A1/de active Application Filing
- 2007-04-12 US US12/297,082 patent/US7995367B2/en not_active Expired - Fee Related
- 2007-04-12 GB GB0817674A patent/GB2449609A/en not_active Withdrawn
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US20020057604A1 (en) * | 2000-09-15 | 2002-05-16 | Stmicroelectronics S.R.I. | Reading circuit for semiconductor non-volatile memories |
EP1195771A2 (de) * | 2000-10-05 | 2002-04-10 | Texas Instruments Incorporated | Differentielle Spannungsbewerterschaltung zum Bewerten des Zustands von CMOS-Prozess kompatiblen fuses bei niedrigen Versorgungsspannungen |
US6775186B1 (en) * | 2003-07-03 | 2004-08-10 | Tower Semiconductor Ltd. | Low voltage sensing circuit for non-volatile memory device |
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US8040340B2 (en) * | 2007-11-05 | 2011-10-18 | Himax Technologies Limited | Control circuit having a comparator for a bandgap circuit |
Also Published As
Publication number | Publication date |
---|---|
GB0817674D0 (en) | 2008-11-05 |
GB2449609A (en) | 2008-11-26 |
US7995367B2 (en) | 2011-08-09 |
DE102006017480A1 (de) | 2007-10-18 |
US20090219746A1 (en) | 2009-09-03 |
DE102006017480B4 (de) | 2008-11-27 |
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