发明授权
- 专利标题: Interfacing between differing voltage level requirements in an integrated circuit system
- 专利标题(中): 集成电路系统中不同电压等级要求之间的接口
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申请号: US12610276申请日: 2009-10-31
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公开(公告)号: US08130030B2公开(公告)日: 2012-03-06
- 发明人: Pankaj Kumar , Pramod Elamannu Parameswaran , Makeshwar Kothandaraman , Vani Deshpande , John Kriz
- 申请人: Pankaj Kumar , Pramod Elamannu Parameswaran , Makeshwar Kothandaraman , Vani Deshpande , John Kriz
- 申请人地址: US CA Milpitas
- 专利权人: LSI Corporation
- 当前专利权人: LSI Corporation
- 当前专利权人地址: US CA Milpitas
- 代理商 Raj Abhyanker, P.C.
- 主分类号: G05F1/10
- IPC分类号: G05F1/10
摘要:
A method includes controllably generating a first bias voltage from a supply voltage to be within an upper tolerable limit of an operating voltage of an IO receiver, and controllably generating a second bias voltage from an external voltage supplied through an IO pad to be within the upper tolerable limit of the operating voltage of the IO receiver. The method also includes deriving an output voltage from the first bias voltage during a normal condition and a tolerant condition, and deriving the output voltage from the second bias voltage during a failsafe condition. The tolerant condition is a mode of operation where the external voltage supplied through the IO pad varies from zero to a value higher than the supply voltage, and the failsafe condition is a mode of operation where the supply voltage is zero.
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