JP2017139046A - アンチヒューズ型ワンタイムプログラマブルメモリセルをプログラムするための方法 - Google Patents
アンチヒューズ型ワンタイムプログラマブルメモリセルをプログラムするための方法 Download PDFInfo
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Abstract
Description
Claims (9)
- アンチヒューズ型ワンタイムプログラマブルメモリセルをプログラムするための方法であって、前記アンチヒューズ型ワンタイムプログラマブルメモリセルは、第1の制御トランジスタと、第1のアンチヒューズトランジスタとを備え、前記第1の制御トランジスタは、ゲート端子と、第1のドレイン/ソース端子と、第2のドレイン/ソース端子とを備え、前記第1のアンチヒューズトランジスタは、ゲート端子と、第1のドレイン/ソース端子とを備え、前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子は、前記第1の制御トランジスタの前記第2のドレイン/ソース端子と接続されており、前記方法は、
(a)前記第1のアンチヒューズトランジスタの前記ゲート端子に第1のプログラム電圧を与え、前記第1の制御トランジスタをオンにするステップであって、第1のビット線電圧が前記第1の制御トランジスタの前記第1のドレイン/ソース端子から前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子へと伝送され、第1の極性を有する第1の電圧ストレスが前記第1のアンチヒューズトランジスタのゲート酸化層に与えられ、前記第1のアンチヒューズトランジスタの前記ゲート端子と、前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子との間に微弱経路が形成されるステップと、
(b)前記第1のアンチヒューズトランジスタの前記ゲート端子に第2のプログラム電圧を与え、前記第1の制御トランジスタをオンにするステップであって、第2のビット線電圧が前記第1の制御トランジスタの前記第1のドレイン/ソース端子から前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子へと伝送され、第2の極性を有する第2の電圧ストレスが前記第1のアンチヒューズトランジスタの前記ゲート酸化層に与えられ、前記微弱経路に沿ってプログラム電流が生成され、それによって、前記第1のアンチヒューズトランジスタの前記ゲート酸化層が破断されるステップと
を含む、方法。 - 前記第1の制御トランジスタの前記ゲート端子に第1の制御電圧が与えられ、それによって、前記第1の制御トランジスタがオンにされる、請求項1に記載の方法。
- 前記第1の制御トランジスタおよび前記第1のアンチヒューズトランジスタはN型トランジスタであり、前記第1のビット線電圧は前記第1のプログラム電圧よりも高く、前記第2のプログラム電圧は前記第1のビット線電圧よりも高く、前記第1のビット線電圧は前記第2のビット線電圧よりも高い、請求項1に記載の方法。
- 前記ステップ(a)において、第1の方向における微弱電流がさらに生成され、前記微弱電流は前記微弱経路に沿って流れ、前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子から、前記第1のアンチヒューズトランジスタの前記ゲート端子へと流れる、請求項3に記載の方法。
- 前記ステップ(b)において、前記プログラム電流は前記微弱経路に沿って第2の方向に流れ、前記第1のアンチヒューズトランジスタの前記ゲート端子から、前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子へと流れる、請求項4に記載の方法。
- 前記第1の制御トランジスタの前記第1のドレイン/ソース端子はビット線と接続されており、前記第1の制御トランジスタの前記ゲート端子はワード線と接続されており、前記第1のアンチヒューズトランジスタの前記ゲート端子は第1のアンチヒューズ制御線と接続されている、請求項1に記載の方法。
- 前記アンチヒューズ型ワンタイムプログラマブルメモリセルは、
第2の制御トランジスタであって、前記第2の制御トランジスタでの第1のドレイン/ソース端子はビット線と接続されており、前記第2の制御トランジスタのゲート端子はワード線と接続されている、第2の制御トランジスタと、
前記第1の制御トランジスタであって、前記第1の制御トランジスタの前記ゲート端子は選択線と接続されており、前記第1の制御トランジスタの前記第1のドレイン/ソース端子は前記第2の制御トランジスタの第2のドレイン/ソース端子と接続されている、前記第1の制御トランジスタと、
前記第1のアンチヒューズトランジスタであって、前記第1のアンチヒューズトランジスタの前記ゲート端子は第1のアンチヒューズ制御線と接続されており、前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子は前記第1の制御トランジスタの前記第2のドレイン/ソース端子と接続されている、前記第1のアンチヒューズトランジスタと
を備える、請求項1に記載の方法。 - 前記第1の制御トランジスタの前記第1のドレイン/ソース端子はビット線と接続されており、前記第1の制御トランジスタの前記ゲート端子はワード線と接続されており、前記第1のアンチヒューズトランジスタの前記ゲート端子は第1のアンチヒューズ制御線と接続されており、前記第1のアンチヒューズトランジスタの前記第1のドレイン/ソース端子と、前記第1のアンチヒューズトランジスタの第2のドレイン/ソース端子とは互いに接続されている、請求項1に記載の方法。
- 前記アンチヒューズ型ワンタイムプログラマブルメモリセルは、
前記第1の制御トランジスタと、
前記第1のアンチヒューズトランジスタと、
第2のアンチヒューズトランジスタであって、前記第2のアンチヒューズトランジスタのゲート端子は第2のアンチヒューズ制御線と接続されており、前記第2のアンチヒューズトランジスタの第1のドレイン/ソース端子は、前記第1の制御トランジスタの前記第2のドレイン/ソース端子と接続されており、前記第2のアンチヒューズトランジスタの前記第1のドレイン/ソース端子と、前記第2のアンチヒューズトランジスタの第2のドレイン/ソース端子とは互いに接続されている、第2のアンチヒューズトランジスタと
を備える、請求項8に記載の方法。
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