JP4277102B2 - Pcramの再書込み防止 - Google Patents
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- 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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- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4091—Sense or sense/refresh amplifiers, or associated sense circuitry, e.g. for coupled bit-line precharging, equalising or isolating
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- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
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- G11C13/0009—RRAM elements whose operation depends upon chemical change
- G11C13/0011—RRAM elements whose operation depends upon chemical change comprising conductive bridging RAM [CBRAM] or programming metallization cells [PMCs]
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Description
本発明は、PCRAMメモリーセルをリフレッシュすることなく読み出す方法及び装置に指向したものである。PCRAMセルのプログラマブル導体をそのビット線に結合した所定時間後に、このプログラム導体をこのビット線から切り離す。この所定時間は、N−センスアンプ及びP−センスアンプが作動(活性化)する前の時点に選定する。このようにして、N−センスアンプ及びP−センスアンプが、ビット線上の電位を変化させることができ、変化した電位によってPCRAMセルを再書込みすることがない。ワード線に結合されたゲートを有するアクセス・トランジスタを用いるPCRAMアレイでは、ワード線を活性化した所定時間後にこのワード線を不活性化することによって、本発明を実施することができる。アクセス・トランジスタを具えていないPCRAMアレイでは、PCRAMセルとセンスアンプとの間の各ビット線に絶縁トランジスタを付加して、PCRAMセルを関連するビット線から切り離すことができる。
以下、本発明の実施例について図面を参照しながら説明する。各図面中では、同一参照番号は同一要素を示す。図4にはPCRAMセル400を示し、図5には複数のPCRAMセル400a〜400hから成るメモリーデバイス500を示す。図4に示すように、PCRAMセル400は、アクセス・トランジスタ401、プログラマブル導体メモリー素子402、及びセル・プレート403を具えている。アクセス・トランジスタ401は、そのゲートがワード線405に結合され、1つの端子がビット線406に結合されている。こうしたセルのアレイのごく一部分を図5に示し、この部分はビット線406a、406a’、406b、406b’、及びワード線405a、405b、405c、及び405dを含む。図5に示すように、ビット線406a、406bはそれぞれ、プリチャージ回路501a、501bに結合され、これらのプリチャージ回路は、プリチャージ電位を、スイッチ可能な形で、ビット線406a、406a’、406b、406b’に供給することができる。アクセス・トランジスタ401の他の端子は、プログラマブル導体メモリー素子402の一方の端に結合され、プログラマブル導体メモリー素子の他方の端はセル・プレート403に結合されている。セル・プレート403は、他のいくつかのPCRAMセルに及んで、これらに結合することができる。セル・プレート403は、電源にも結合されている。好適な実施例では、電源が1.25V(Vdd/2)である。
Claims (36)
- プログラマブル導体ランダムアクセスメモリーセルからデータを読み出す装置を具えたメモリーデバイスであって、
前記装置が、
読み出し動作中に、前記メモリーセルを、アドレス指定されて活性化されたワード線と、アドレス指定されて活性化されたビット線との間に結合するアクセス回路と;
前記活性化されたビット線及び基準電圧ビット線を、所定のプリチャージ電圧にプリチャージするプリチャージ回路と;
前記基準電圧ビット線及び前記活性化されたビット線に結合されて、前記メモリーセルの論理状態を検出するセンスアンプであって、アドレス指定された前記メモリーセルを読み出すことによって前記活性化されたビット線上に供給される電圧を、前記基準電圧ビット線上の前記プリチャージ電圧と比較して、比較の結果に応じた出力電圧を発生すべく動作するセンスアンプと;
前記メモリーセルが、前記読み出し動作に応答して前記センスアンプによって発生される前記出力電圧によってリフレッシュされることを防止する防止回路と
を具えていることを特徴とするメモリーデバイス。 - 前記アクセス回路がトランジスタ回路であり、前記メモリーセルの論理状態が前記活性化されたビット線に転送された後であって、かつ前記センスアンプが前記メモリーセルの論理状態を検出する前に、前記防止回路が前記活性化されたワード線を不活性化することを特徴とする請求項1に記載のメモリーデバイス。
- 前記防止回路がトランジスタを具えて、該トランジスタが前記活性化されたワード線を不活性化することを特徴とする請求項2に記載のメモリーデバイス。
- 前記トランジスタが、前記ワード線と前記ワード線用のドライバとの間に直列接続されて、前記読み出し動作中に、前記トランジスタがオン状態になり、そしてオフ状態になって、前記ワード線を不活性化することを特徴とする請求項3に記載のメモリーデバイス。
- 前記トランジスタが、前記ワード線と接地との間に接続されて、前記読み出し動作中にオフ状態になり、そしてオン状態になって、前記ワード線を不活性化することを特徴とする請求項3に記載のメモリーデバイス。
- 前記防止回路が、活性化されたビット線と、前記活性化されたビット線に関連するセンスアンプとの間に直列接続されたトランジスタを具えて、前記直列接続されたトランジスタを、読み出し動作中にオン状態にして、前記メモリーセルがリフレッシュ可能になる前にオフ状態にすることを特徴とする請求項1に記載のメモリーデバイス。
- 前記メモリーセルが、前記活性化されたビット線に論理状態を転送し始めた所定時間後に、前記防止回路が、前記活性化されたワード線を不活性化することを特徴とする請求項1に記載のメモリーデバイス。
- さらに、前記センスアンプが、第1センスアンプ部と第2センスアンプ部から成ることを特徴とする請求項7に記載のメモリーデバイス。
- 前記所定時間が、前記第1センスアンプ部が作動した後であり、かつ前記第2センスアンプ部が作動する前であることを特徴とする請求項8に記載のメモリーデバイス。
- 前記第1センスアンプ部がN−センスアンプであり、前記第2センスアンプ部がP−センスアンプであることを特徴とする請求項8に記載のメモリーデバイス。
- さらに、前記活性化されたビット線及び前記基準電圧ビット線をプリチャージするプリチャージ回路を具えて、前記活性化されたビット線及び前記基準電圧ビット線が前記センスアンプに結合されていることを特徴とする請求項1に記載のメモリーデバイス。
- 前記センスアンプが、前記活性化されたビット線を論理状態検出する前に、前記プリチャージ回路が、前記活性化されたビット線及び前記基準電圧ビット線をプリチャージすることを特徴とする請求項11に記載のメモリーデバイス。
- プロセッサと;
メモリーとを具えたシステムであって、
前記メモリーが、プログラマブル導体ランダムアクセスメモリーセルからデータを読み出す装置を具えて、
前記装置が、
読み出し動作中に、前記メモリーセルを、アドレス指定されて活性化されたワード線とアドレス指定されて活性化されたビット線との間に結合するアクセス回路と;
前記活性化されたビット線及び基準電圧ビット線を、所定のプリチャージ電圧にプリチャージするプリチャージ回路と;
前記基準電圧ビット線及び前記活性化されたビット線に結合されて、前記メモリーセルの論理状態を検出するセンスアンプであって、アドレス指定された前記メモリーセルを読み出すことによって前記活性化されたビット線上に供給される電圧を、前記基準電圧ビット線上の前記プリチャージ電圧と比較して、比較の結果に応じた出力電圧を発生すべく動作するセンスアンプと;
前記メモリーセルが、前記読み出し動作に応答して前記センスアンプによって発生される前記出力電圧によってリフレッシュされることを防止する防止回路と
を具えていることを特徴とするシステム。 - 前記アクセス回路がトランジスタ回路であり、前記メモリーセルの論理状態が前記活性化されたビット線に転送された後であって、かつ前記センスアンプが前記メモリーセルの論理状態を検出する前に、前記防止回路が前記活性化されたワード線を不活性化することを特徴とする請求項13に記載のシステム。
- 前記防止回路がトランジスタを具えて、該トランジスタが、前記活性化されたワード線を不活性化することを特徴とする請求項14に記載のシステム。
- 前記トランジスタが、前記ワード線と前記ワード線用のドライバとの間に直列接続されて、前記読み出し動作中に、前記トランジスタがオン状態になり、そしてオフ状態になって、前記ワード線を不活性化することを特徴とする請求項15に記載のシステム。
- 前記トランジスタが、前記ワード線と接地との間に接続されて、前記読み出し動作中にオフ状態になり、そしてオン状態になって、前記ワード線を不活性化することを特徴とする請求項15に記載のシステム。
- 前記防止回路が、活性化されたビット線と、前記活性化されたビット線に関連するセンスアンプとの間に直列接続されたトランジスタを具えて、前記直列接続されたトランジスタを、読み出し動作中にオン状態にして、前記メモリーセルがリフレッシュ可能になる前にオフ状態にすることを特徴とする請求項13に記載のシステム。
- 前記メモリーセルが、前記活性化されたビット線に論理状態を転送し始めた所定時間後に、前記防止回路が、前記活性化されたワード線を不活性化することを特徴とする請求項13に記載のシステム。
- さらに、前記センスアンプが、第1センスアンプ部と第2センスアンプ部から成ることを特徴とする請求項19に記載のシステム。
- 前記所定時間が、前記第1センスアンプ部が作動した後であり、かつ前記第2センスアンプ部が作動する前であることを特徴とする請求項20に記載のシステム。
- 前記第1センスアンプ部がN−センスアンプであり、前記第2センスアンプ部がP−センスアンプであることを特徴とする請求項20に記載のシステム。
- さらに、前記活性化されたビット線及び前記基準電圧ビット線をプリチャージするプリチャージ回路を具えて、前記活性化されたビット線及び前記基準電圧ビット線が前記センスアンプに結合されていることを特徴とする請求項13に記載のシステム。
- 前記センスアンプが、前記活性化されたビット線を論理状態検出する前に、前記プリチャージ回路が、前記活性化されたビット線及び前記基準電圧ビット線をプリチャージすることを特徴とする請求項23に記載のシステム。
- プログラマブル導体ランダムアクセスメモリーセルからデータを読み出す方法であって、この方法が、
アドレス指定されて活性化されたビット線及び基準電圧ビット線を、所定のプリチャージ電圧にプリチャージするステップと;
前記メモリーセルを含むアドレス指定されたワード線を活性化して、前記メモリーセル内の論理値を、当該メモリーセルに関連する前記アドレス指定されたビット線に転送するステップと;
前記アドレス指定されたワード線を不活性化するステップと;
前記アドレス指定されたワード線が不活性化された後に、前記アドレス指定されたビット線に関連するセンスアンプを用いて、当該ビット線上の電圧を前記基準電圧ビット線上の前記プリチャージ電圧と比較することによって、前記アドレス指定されたビット線に転送された前記論理値を検出するステップと;
読出し動作中に、前記アドレス指定されたビット線を前記センスアンプに電気的に接続し、前記メモリーセルがリフレッシュ可能になる前に、当該ビット線を前記センスアンプから切り離すことによって、前記検出する動作の結果として前記メモリーセルがリフレッシュされることを防止するステップと
を具えていることを特徴とするデータの読み出し方法。 - 前記活性化の所定時間後に、前記不活性化を実行することを特徴とする請求項25に記載の方法。
- 前記検出するステップがさらに、
第1センスアンプ・ユニットを作動させるステップと;
前記第1センスアンプ・ユニットを作動させた第1所定時間後に、第2センスアンプ・ユニットを作動させるステップと
を具えていることを特徴とする請求項25に記載の方法。 - 前記アドレス指定されたワード線を活性化した第2所定時間後に、前記不活性化を実行することを特徴とする請求項25に記載の方法。
- 前記第2所定時間が、前記第1センスアンプ・ユニットを作動させた後であり、かつ前記第2センスアンプ・ユニットを作動させる前であることを特徴とする請求項28に記載の方法。
- 前記第2所定時間が、前記第1センスアンプ・ユニットを作動させる前であり、かつ前記第2センスアンプ・ユニットを作動させる前であることを特徴とする請求項28に記載の方法。
- プログラマブル導体ランダムアクセスメモリーセルからデータを読み出す方法であって、この方法が、
前記メモリーセルに結合された第1ビット線をプリチャージするステップを具え、前記メモリーセルがプログラマブル導体メモリー素子を含み;
前記方法がさらに、
第2ビット線を所定のプリチャージ電圧にプリチャージするステップと;
前記第1ビット線の電圧を増加させるステップと;
前記メモリーセルのアクセス・トランジスタをオン状態に切り換えて、前記プログラマブル導体メモリー素子を前記第1ビット線に結合するステップと;
前記セルの前記アクセス・トランジスタをオフ状態に切り換えて、前記プログラマブル導体メモリー素子を前記第1ビット線から切り離すステップと;
前記第1ビット線及び前記第2ビット線の電圧をセンスアンプによって検出して、前記プログラマブル導体メモリー素子の論理状態を特定するステップとを具え、
前記オフ状態への切り換えを前記検出の前に実行し、前記センスアンプが作動するまで、前記第2ビット線が前記プリチャージ電圧を維持することを特徴とするデータの読み出し方法。 - 前記アクセス・トランジスタのオン状態への切り換えの所定時間後に、前記アクセス・トランジスタのオフ状態への切り換えを実行することを特徴とする請求項31に記載の方法。
- 前記論理状態を特定するステップがさらに、
第1センスアンプ・ユニットを作動させるステップと;
前記第1センスアンプ・ユニットを作動させた第1所定時間後に、第2センスアンプ・ユニットを作動させるステップと
を具えていることを特徴とする請求項31に記載の方法。 - 前記アクセス・トランジスタのオン状態への切り換えの第2所定時間後に、前記アクセス・トランジスタのオフ状態への切り換えを行うことを特徴とする請求項33に記載の方法。
- 前記第2所定時間後が、前記第1センスアンプ・ユニットを作動させた後であり、かつ前記第2センスアンプ・ユニットを作動させる前であることを特徴とする請求項34に記載の方法。
- 前記第2所定時間後が、前記第1センスアンプ・ユニットを作動させる前であり、かつ前記第2センスアンプ・ユニットを作動させる前であることを特徴とする請求項34に記載の方法。
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US10/035,197 US6909656B2 (en) | 2002-01-04 | 2002-01-04 | PCRAM rewrite prevention |
PCT/US2003/000239 WO2003058634A1 (en) | 2002-01-04 | 2003-01-06 | Pcram rewrite prevention |
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EP (1) | EP1468422B1 (ja) |
JP (1) | JP4277102B2 (ja) |
KR (1) | KR100616208B1 (ja) |
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US20040071042A1 (en) | 2004-04-15 |
ATE548734T1 (de) | 2012-03-15 |
CN1679116B (zh) | 2011-04-27 |
US7224632B2 (en) | 2007-05-29 |
US6882578B2 (en) | 2005-04-19 |
JP2005515577A (ja) | 2005-05-26 |
KR100616208B1 (ko) | 2006-08-25 |
KR20040075053A (ko) | 2004-08-26 |
US6909656B2 (en) | 2005-06-21 |
CN1679116A (zh) | 2005-10-05 |
EP1468422B1 (en) | 2012-03-07 |
WO2003058634A1 (en) | 2003-07-17 |
AU2003235728A1 (en) | 2003-07-24 |
US20050146958A1 (en) | 2005-07-07 |
EP1468422A1 (en) | 2004-10-20 |
US20030128612A1 (en) | 2003-07-10 |
CN102169725B (zh) | 2015-10-28 |
CN102169725A (zh) | 2011-08-31 |
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