发明申请
US20100259979A1 Self Limiting Method For Programming A Non-volatile Memory Cell To One Of A Plurality Of MLC Levels
审中-公开
用于将非易失性存储器单元编程为多个MLC级别之一的自限制方法
- 专利标题: Self Limiting Method For Programming A Non-volatile Memory Cell To One Of A Plurality Of MLC Levels
- 专利标题(中): 用于将非易失性存储器单元编程为多个MLC级别之一的自限制方法
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申请号: US12422175申请日: 2009-04-10
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公开(公告)号: US20100259979A1公开(公告)日: 2010-10-14
- 发明人: James Yingbo Jia , Douglas Lee , Bomy Chen
- 申请人: James Yingbo Jia , Douglas Lee , Bomy Chen
- 主分类号: G11C16/04
- IPC分类号: G11C16/04 ; G11C7/06
摘要:
A flash memory cell is of the type having a substrate of a first conductivity type having a first region of a second conductivity type at a first end, and a second region of the second conductivity type at a second end, spaced apart from the first end, with a channel region between the first end and the second end, a floating gate insulated from a first portion of the channel region and adjacent to the second region, a first control gate adjacent to the floating gate and insulated therefrom, and insulated from a second portion of the channel region, and adjacent to the first region, a second control gate capacitively coupled to the floating gate, and positioned over the floating gate. A method programming the cell to one of a plurality of MLC states comprises applying a current source to the first region. A first voltage is applied to the first control gate sufficient to turn on the second portion of the channel region. A second voltage is applied to the second region, sufficient to cause electrons to flow from the first region towards the second region. A third voltage is applied to the second control gate sufficient to cause electrons in the channel region to be injected onto the floating gate. The third voltage is applied uninterrupted until the floating gate is programmed to the one state.
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