发明授权
- 专利标题： Circuit and method for protecting electronic devices
- 专利标题（中）： 用于保护电子设备的电路和方法
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申请号： US10086296申请日： 2002-03-01
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公开(公告)号： US06934854B2公开(公告)日： 2005-08-23
- 发明人: Eric-Roger Brücklmeier , Herbert Palm , Andreas Kux
- 申请人： Eric-Roger Brücklmeier , Herbert Palm , Andreas Kux
- 申请人地址： DE Munich
- 专利权人： Infineon Technologies AG
- 当前专利权人： Infineon Technologies AG
- 当前专利权人地址： DE Munich
- 代理商 Laurence A. Greenberg; Werner H. Stemer; Ralph E. Locher
- 优先权： DE19941682 19990901
- 主分类号： G06K19/073
- IPC分类号： G06K19/073 ; G07C9/00 ; G07F7/10 ; G06F17/00
摘要：
The access time for the use of an electronic device, for example a chip, is prolonged after each unauthorized access attempt. The access time is determined by the time for the matching of the turn-on voltages of two floating gate cells. Before an access attempt, the turn-on voltage of one cell is set to a predefined initial value and the turn-on voltage of the other cell is set to a value which is higher in comparison and which is increased after each unauthorized access.
公开/授权文献
- US20020129258A1 Circuit and method for protecting electronic devices 公开/授权日：2002-09-12
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