JP2021503177A - 不揮発性メモリにおけるワードプログラミングのためのバイアス方式及び禁止擾乱低減 - Google Patents
不揮発性メモリにおけるワードプログラミングのためのバイアス方式及び禁止擾乱低減 Download PDFInfo
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Abstract
Description
メモリデバイスの一実施形態によると、メモリデバイスは、フラッシュメモリ部分と電気的消去可能PROM(EEPROM)部分とに分割された不揮発性メモリ(NVM)アレイを含む。NVMアレイは行及び列で配置された電荷トラップメモリセルを含み、各メモリセルは、ソース及びドレイン領域内に傾斜型低ドープドレイン(LDD:lightly doped drain)インプラントを含むメモリトランジスタを含む。傾斜型LDDインプラントは、メモリトランジスタの酸化物−窒化物−酸化物(ONO:oxide−nitride−oxide)積層の下とハローインプラントを有する共有ソース領域を含む選択トランジスタの下とに少なくとも部分的に延びる。共有ソース領域はNVMアレイの同じ行の2つの隣接メモリセル間で共有され得る。一実施形態では、フラッシュメモリ部分とEEPROM部分は1つの単一半導体ダイ内に配置され得る。
Claims (20)
- フラッシュメモリ部分と電気的消去可能PROM(EEPROM)部分とに分割された不揮発性メモリ(NVM)アレイであって列及び行で配置された電荷トラップメモリセルを含む不揮発性メモリ(NVM)アレイを含むメモリデバイスであって、各メモリセルは、
ソース及びドレイン領域内に傾斜型低ドープドレイン(LDD)インプラントを含むメモリトランジスタであって、前記傾斜型LDDインプラントは前記メモリトランジスタの酸化物−窒化物−酸化物(ONO)積層の下に少なくとも部分的に延びる、メモリトランジスタと、
ハローインプラントを有する共有ソース領域を含む選択トランジスタであって、前記共有ソース領域は前記NVMアレイの同じ行の2つの隣接メモリセル間で共有される、選択トランジスタと、を含み、
前記フラッシュメモリ部分及び前記EEPROM部分は1つの単一半導体ダイ内に配置される、メモリデバイス。 - 前記メモリセルは2トランジスタ(2T)アーキテクチャを有する、請求項1に記載のメモリデバイス。
- それぞれが電荷トラップ酸窒化層を含む前記メモリトランジスタはシリコン−酸化物−窒化物−酸化物−シリコン(SONOS)に基づく、請求項1に記載のメモリデバイス。
- 前記電荷トラップ酸窒化層は約40〜60%の範囲内のシリコン含有量と約10〜40%の範囲内の酸素含有量とを有する、請求項3に記載のメモリデバイス。
- 前記ハローインプラントは前記2つの隣接メモリセルの前記共有ソース領域を少なくとも部分的に囲む、請求項1に記載のメモリデバイス。
- 前記選択トランジスタは非対称トランジスタであり、前記選択トランジスタのドレイン領域は前記ハローインプラントを含まない、請求項1に記載のメモリデバイス。
- 前記メモリトランジスタの前記傾斜型LDDインプラントは約1e12〜1e14原子/cm2の範囲内のドーパントドーズを含む、請求項1に記載のメモリデバイス。
- 前記メモリセルは、n型トランジスタを含み、p型ウェル内に少なくとも部分的に配置され、前記p型ウェルは約1e12〜1e14原子/cm2の範囲内のドーパントドーズを含む、請求項1に記載のメモリデバイス。
- 前記p型ウェルは傾斜接合のために前記メモリトランジスタの前記ソース領域との接合の周囲でボロン原子によりドープされる、請求項8に記載のメモリデバイス。
- 前記選択トランジスタの前記共有ソース領域は第1のLDDを含み、前記第1のLDDと前記ハローインプラントは反対の型のドーパントによりインプラントされる、請求項1に記載のメモリデバイス。
- 前記メモリデバイスの前記EEPROM部分はワードプログラミングを行うように構成され、複数のワードが、複数のプログラム動作を使用して前記NVMアレイの前記EEPROM部分の1つの選択された行へ順次書き込まれ、いかなる消去動作も前記複数のプログラム動作の各プログラム動作間に行われない、請求項1に記載のメモリデバイス。
- 行及び列で配置されたメモリセルを含む電気的消去可能PROM(EEPROM)部分を含むメモリアレイであって、
前記EEPROM部分では、各メモリセルは電荷トラップ不揮発性メモリ(NVM)トランジスタを含み、同じ行内のメモリセルはSONOSワード線を共有し、同じ列内のメモリセルはビット線を共有し、2つの隣接列内のメモリセルは共通ソース線へ結合し、
前記EEPROM部分の選択された行のワードプログラミング中、複数のワードが、複数のプログラム動作を使用して、選択された行のメモリセルへ順次書き込まれ、いかなる消去動作も前記複数のプログラム動作の各プログラム動作間に行われなく、
前記選択された行の第1の部分への第1のワードのプログラミング中、正電圧が前記選択された行に関連するSONOSワード線へ印加され、約1.5V〜2.5Vの範囲内の高い禁止電圧が前記第1の部分のメモリセルに関連するビット線へ印加され、消去状態が書き込まれ、前記高い禁止電圧はさらに、前記第1の部分以外の前記選択された行の部分内のメモリセルに関連するビット線へ印加される、メモリアレイ。 - 前記選択された行の第2の部分への第2のワードのプログラミング中、前記高い禁止電圧は前記第2の部分のメモリセルに関連するビット線へ印加され、消去状態が書き込まれ、前記第1及び第2の部分以外の前記選択された行の部分内のメモリセル、請求項12に記載のメモリアレイ。
- 前記第1と第2の部分は重ならない、請求項13に記載のメモリアレイ。
- フラッシュメモリ部分をさらに含む請求項12に記載のメモリアレイであって、前記フラッシュメモリ部分及び前記EEPROM部分は1つの単一半導体ダイ内に配置される、メモリアレイ。
- 前記EEPROM部分の前記メモリセルのそれぞれは非対称選択トランジスタをさらに含み、前記非対称選択トランジスタの前記ソースはハローインプラントを含む、請求項12に記載のメモリアレイ。
- フラッシュメモリ部分と電気的消去可能PROM(EEPROM)部分とに分割された不揮発性メモリ(NVM)アレイを含む埋め込み型システムであって、
前記フラッシュ及びEEPROM部分のそれぞれは行及び列で配置された電荷トラップメモリセルを含み、各メモリセルは、
ソース及びドレイン領域内に傾斜型低ドープドレイン(LDD)インプラントを含むシリコン−酸化物−窒化物−酸化物−シリコン(SONOS)ベースメモリトランジスタであって、前記ドレイン領域はビット線へ結合され且つ制御ゲートはSONOSワード線へ結合される、メモリトランジスタと、
ハローインプラントを有する共有ソース領域を含む選択トランジスタであって、前記共有ソース領域は前記NVMアレイの同じ行の2つの隣接メモリセル間で共有される、選択トランジスタと、
前記EEPROM部分へ結合されたプログラマブル制御回路系であって、前記EEPROM部分の1つの選択された行のワードプログラミングを可能にする動作電圧を提供するように構成されたプログラマブル制御回路系と、を含む、埋め込み型システム。 - 前記メモリトランジスタの前記傾斜型LDDインプラントは約1e12〜1e14原子/cm2の範囲内のドーパントドーズを含む、埋め込み型システム。
- 前記ワードプログラミングは、複数のプログラム動作を使用することにより複数のワードを前記選択された行へ順次に書き込むことを含み、いかなる消去動作も前記複数のプログラム動作の各プログラム動作間に行われない、請求項17に記載の埋め込み型システム。
- 前記動作電圧は、
前記選択された行のメモリセルに関連するSONOSワード線へ提供される第1の高電圧と;
禁止されるメモリセルに関連するビット線へ提供される第2の高電圧と
を含み、前記第2の高電圧は禁止擾乱を低減するために約1.5V〜2.5Vの範囲内の禁止電圧である、請求項19に記載の埋め込み型システム。
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