- 专利标题: Static random access memory (SRAM) bit cells with wordline landing pads split across boundary edges of the SRAM bit cells
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申请号: US14559258申请日: 2014-12-03
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公开(公告)号: US09876017B2公开(公告)日: 2018-01-23
- 发明人: Niladri Narayan Mojumder , Stanley Seungchul Song , Zhongze Wang , Kern Rim , Choh Fei Yeap
- 申请人: QUALCOMM Incorporated
- 申请人地址: US CA San Diego
- 专利权人: QUALCOMM Incorporated
- 当前专利权人: QUALCOMM Incorporated
- 当前专利权人地址: US CA San Diego
- 代理机构: Withrow & Terranova, PLLC
- 主分类号: H01L27/11
- IPC分类号: H01L27/11 ; H01L23/528 ; H01L27/02 ; G11C5/06 ; G11C8/14 ; G11C11/418 ; G11C11/412 ; G11C8/16 ; H01L21/768
摘要:
Static random access memory (SRAM) bit cells with wordline landing pads split across boundary edges of the SRAM bit cells are disclosed. In one aspect, an SRAM bit cell is disclosed employing write wordline in second metal layer, first read wordline in third metal layer, and second read wordline in fourth metal layer. Employing wordlines in separate metal layers allows wordlines to have wider widths, which decrease wordline resistance, decrease access time, and increase performance of SRAM bit cell. To employ wordlines in separate metal layers, multiple tracks in first metal layer are employed. To couple read wordlines to the tracks to communicate with SRAM bit cell transistors, landing pads are disposed on corresponding tracks inside and outside of a boundary edge of the SRAM bit cell. Landing pads corresponding to the write wordline are placed on corresponding tracks within the boundary edge of the SRAM bit cell.
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