Invention Grant
- Patent Title: DUTY-CYCLE-EFFICIENT SRAM CELL TEST
- Patent Title (中): - 关于向占空比的高效SRAM单元测试
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Application No.: EP02787139.1Application Date: 2002-07-11
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Publication No.: EP1415305B1Publication Date: 2008-09-03
- Inventor: NELSON, Erik.A , PILO,Harold
- Applicant: International Business Machines Corporation , Compagnie IBM France
- Applicant Address: New Orchard Road Armonk, NY 10504 US
- Assignee: International Business Machines Corporation,Compagnie IBM France
- Current Assignee: International Business Machines Corporation,Compagnie IBM France
- Current Assignee Address: New Orchard Road Armonk, NY 10504 US
- Agency: Therias, Philippe
- Priority: US907325 20010717
- International Announcement: WO2003009304 20030130
- Main IPC: G11C29/00
- IPC: G11C29/00
Abstract:
A method and structure for the invention includes an integrated memory structure having a built-in test portion. The integrated memory structure has memory cells, bitlines and wordlines connected to the memory cells, wordline decoders connected to a plurality of the wordlines, bitline restore devices connected to the bitlines for charging the bitlines during read and write operations, and a clock circuit connected to the wordlines. During a test mode the wordline decoders simultaneously select multiple wordlines that the bitline restore devices maintain in an active state and the clock circuit maintains the multiple wordlines and the bitline restore devices in an active state for a period in excess of a normal read cycle. The invention also includes transistors which are connected to the memory cells. The transistors include bitline contacts which are stressed during the test mode.
Public/Granted literature
- EP1415305A2 DUTY-CYCLE-EFFICIENT SRAM CELL TEST Public/Granted day:2004-05-06
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