JP2008546124A - パーコレーション・アルゴリズムを使用した相変化メモリセルの多重レベルプログラミング方法 - Google Patents
パーコレーション・アルゴリズムを使用した相変化メモリセルの多重レベルプログラミング方法 Download PDFInfo
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- JP2008546124A JP2008546124A JP2008514105A JP2008514105A JP2008546124A JP 2008546124 A JP2008546124 A JP 2008546124A JP 2008514105 A JP2008514105 A JP 2008514105A JP 2008514105 A JP2008514105 A JP 2008514105A JP 2008546124 A JP2008546124 A JP 2008546124A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0069—Writing or programming circuits or methods
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- 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
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5678—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using amorphous/crystalline phase transition storage elements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0004—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements comprising amorphous/crystalline phase transition cells
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/004—Reading or sensing circuits or methods
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0064—Verifying circuits or methods
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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
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/10—Programming or data input circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/004—Reading or sensing circuits or methods
- G11C2013/0054—Read is performed on a reference element, e.g. cell, and the reference sensed value is used to compare the sensed value of the selected cell
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0069—Writing or programming circuits or methods
- G11C2013/0078—Write using current through the cell
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0069—Writing or programming circuits or methods
- G11C2013/0083—Write to perform initialising, forming process, electro forming or conditioning
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0069—Writing or programming circuits or methods
- G11C2013/009—Write using potential difference applied between cell electrodes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C2213/00—Indexing scheme relating to G11C13/00 for features not covered by this group
- G11C2213/70—Resistive array aspects
- G11C2213/79—Array wherein the access device being a transistor
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- Crystallography & Structural Chemistry (AREA)
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Abstract
Description
Claims (15)
- 相変化物質よりなるメモリ素子を含む相変化メモリセルであって、前記メモリ素子が、前記相変化物質が結晶質であって最小の抵抗値レベルを有する第1状態、前記相変化物質が非晶質であって最大の抵抗値レベルを有する第2状態、および、前記最小の低効値レベルと前記最大の低効値レベルとの間の複数の抵抗値レベルと関連する複数の中間状態を有する、相変化メモリセルをプログラムする方法であって、複数のプログラミングパルスを前記相変化メモリセルに供給するステップを備える相変化メモリセルプログラム方法において、
第1のプログラミングパルスによって、非晶質状態の前記相変化物質を通る平均直径を有する結晶質のパーコレーション通路を生成し、1つ以上の更なるプログラミングパルスによって、前記結晶質のパーコレーション通路の前記直径を変更して、前記相変化メモリセルを前記複数の中間状態のうちの1つにプログラムすることを特徴とする相変化メモリセルプログラム方法。 - 請求項1に記載の方法において、前記第1のプログラミングパルスを印加する前に、前記相変化物質を前記第2状態にするために、リセットプログラミングパルスを印加するステップを更に含むことを特徴とする相変化メモリセルプログラム方法。
- 請求項1または2に記載の方法において、前記1つ以上の更なるプログラミングパルスは、前記結晶質のパーコレーション通路の前記平均直径を増大させることを特徴とする相変化メモリセルプログラム方法。
- 請求項1〜3のいずれか1項に記載の方法において、前記各1つ以上の更なるプログラミングパルスは、その前のプログラミングパルスよりも振幅を拡大し、且つ、同一パルス幅を有することを特徴とする相変化メモリセルプログラム方法。
- 請求項1〜4のいずれか1項に記載の方法において、前記各1つ以上の更なるプログラミングパルスは、その前のプログラミングパルスと比較して、固定した振幅と拡大したパルス幅を有することを特徴とする相変化メモリセルプログラム方法。
- 請求項1〜5のいずれか1項に記載の方法において、
(a)前記相変化メモリセルの前記電流レベルを読み取るステップと、
(b)前記電流レベルが前記複数の中間状態のうち1つをプログラムするための目標電流レベル以下の場合、前プログラミングパルスよりも大きい振幅を有する更なるプログラミングパルスを印加するステップと、
(c)目標の電流が得られるまで(a)および(b)のステップを繰り返すステップと
を更に含む相変化メモリセルプログラム方法。 - 請求項1〜6のいずれかに記載の方法において、前記相変化メモリセルを、いずれのプログラミングパルスを供給する前に初期化することを特徴とする相変化メモリセルプログラム方法。
- 請求項7に記載の方法において、前記相変化メモリセルを初期化するステップは、前記カルコゲン物質を前記第2状態(リセット状態)にし、その後、前記第1状態(セット状態)にするような振幅と持続時間を有する初期化パルスを供給するステップを含むことを特徴とする相変化メモリセルプログラム方法。
- 各相変化メモリセルが相変化物質よりなるメモリ素子を含み、該メモリ素子が、前記相変化物質が結晶質であって最小の抵抗値レベルを有する第1状態、前記相変化物質が非晶質であって最大の抵抗値レベルを有する第2状態、および、前記最小の低効値レベルと前記最大の低効値レベルとの間の複数の抵抗値レベルと関連する複数の中間状態を有する、複数の相変化メモリセルと、
複数のプログラミングパルスを前記相変化メモリセルに供給するためのプログラム回路とを備えた相変化メモリデバイスにおいて、
前記プログラム回路により生成された第1のプログラミングパルスによって、前記非晶質状態の前記相変化物質を通る平均直径を有する結晶質のパーコレーション通路を生成し、1つ以上の更なるプログラミングパルスによって前記結晶質のパーコレーション通路の前記平均直径を変更して、前記相変化メモリセルを前記複数の中間状態のうちの1つにプログラムすることを特徴とする相変化メモリデバイス。 - 請求項9に記載の相変化メモリデバイスにおいて、前記相変化メモリセルからの電流を読み取り、この電流が所望の前記中間状態に達したかを判定する、前記プログラム回路に結合された照合回路をさらに含むことを特徴とする相変化メモリデバイス。
- 請求項9または10に記載の相変化メモリデバイスにおいて、前記相変化メモリセルはセレクタを含むことを特徴とする相変化メモリデバイス。
- 請求項12に記載の相変化メモリデバイスにおいて、前記セレクタはMOSトランジスタまたはバイポーラトランジスタのいずれかを含むことを特徴とする相変化メモリデバイス。
- 請求項9〜12のいずれか1項に記載の相変化メモリデバイスにおいて、前記相変化メモリセルは、発熱素子を含むことを特徴とする相変化メモリデバイス。
- 処理装置と、
前記処理装置に結合されたインタフェースと
前記処理装置に結合された請求項9〜14のいずれか1項に記載の不揮発性の相変化メモリデバイスと
を備えたシステム。 - 請求項14に記載のシステムにおいて、前記インタフェースは無線インタフェースであることを特徴とするシステム。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05104877A EP1729303B1 (en) | 2005-06-03 | 2005-06-03 | Method for multilevel programming of phase change memory cells using a percolation algorithm |
PCT/EP2006/062812 WO2006128896A1 (en) | 2005-06-03 | 2006-06-01 | Method for multilevel programming of phase change memory cells using a percolation algorithm |
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JP2008546124A true JP2008546124A (ja) | 2008-12-18 |
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JP2008514105A Pending JP2008546124A (ja) | 2005-06-03 | 2006-06-01 | パーコレーション・アルゴリズムを使用した相変化メモリセルの多重レベルプログラミング方法 |
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Country | Link |
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US (1) | US7639526B2 (ja) |
EP (3) | EP1729303B1 (ja) |
JP (1) | JP2008546124A (ja) |
KR (1) | KR101263360B1 (ja) |
CN (1) | CN101238523B (ja) |
DE (1) | DE602005025323D1 (ja) |
WO (1) | WO2006128896A1 (ja) |
Cited By (1)
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US7639526B2 (en) | 2009-12-29 |
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WO2006128896A1 (en) | 2006-12-07 |
EP2249351B1 (en) | 2013-05-01 |
US20080151612A1 (en) | 2008-06-26 |
EP1729303A1 (en) | 2006-12-06 |
CN101238523A (zh) | 2008-08-06 |
KR20080021688A (ko) | 2008-03-07 |
CN101238523B (zh) | 2012-03-28 |
EP1729303B1 (en) | 2010-12-15 |
EP2249351A1 (en) | 2010-11-10 |
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