Variable resistance nonvolatile memory device and method of writing thereby

• Main Authors: AZUMA RYOTARO, KAWAHARA AKIFUMI, SHIMAKAWA KAZUHIKO, TANABE KOUHEI
• Format: Patent
• Language: English
• Published: 02.12.2014
• Subjects: INFORMATION STORAGE; PHYSICS; STATIC STORES

Provided is a variable resistance nonvolatile memory device that achieves, in multi-bit simultaneous writing for increasing a writing speed, writing with little variation caused by positions of memory cells in multi-bit simultaneous writing. The variable resistance nonvolatile memory device includes bit lines, word lines, memory cells, a first write circuit (e.g., a write circuit (60-0)), a second write circuit (e.g., a write circuit (60-k−1)), a first selection circuit (e.g., a selection circuit (S0-0)), a second selection circuit (e.g., a selection circuit (S0_k−1)), and a first word line drive circuit (a word line drive circuit (40-1)), wherein the first selection circuit (e.g., an NMOS transistor (TS0-0-0 to TS0-0_m−1) included in the selection circuit) has a greater ON resistance than the second selection circuit (e.g., an NMOS transistor (TS0_k−1-0 to TS0_k−1_m−1) included in the selection circuit) does.