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2. 发明授权

US6141282A Circuit for designating an operating mode of a semiconductor memory device 有权
标题翻译：用于指定半导体存储器件的工作模式的电路
公开(公告)号：US6141282A
公开(公告)日：2000-10-31
申请号：US234779
申请日：1999-01-20
申请人： Choong-Sun Chin , Hyung-Kyu Lim
发明人： Choong-Sun Chin , Hyung-Kyu Lim
IPC分类号： G11C11/407 , G11C7/10 , G11C17/18 , G11C7/00
CPC分类号： G11C17/18 , G11C7/1045
摘要： A circuit for designating an operating mode of a packaged semiconductor memory device includes a first fuse mounted on the device. A plurality of pads mounted on the device are accessible to a user after the device is packaged. A mode selection circuit generates a first signal when the first fuse is open and a second signal when the first fuse is closed. A first-fuse opening circuit is operably connected to the pads and opens the first fuse responsive to a predetermined first-fuse cutting signal on the pads. In another aspect of the invention, a second fuse may be opened responsive to a predetermined second-fuse cutting signal on the pads. When the second fuse opens, the first-fuse opening circuit is disabled to prevent accidental opening of the first fuse when the desired operating mode requires the first fuse to be maintained intact.
摘要翻译：用于指定封装半导体存储器件的操作模式的电路包括安装在该器件上的第一熔丝。安装在设备上的多个焊盘在设备被封装之后可被用户访问。模式选择电路当第一保险丝断开时产生第一信号，并且当第一保险丝闭合时产生第二信号。第一保险丝开路电路可操作地连接到焊盘，并响应于焊盘上的预定的第一熔丝切割信号而打开第一熔丝。在本发明的另一方面，可以响应于焊盘上的预定的第二熔丝切割信号来打开第二熔丝。当第二个保险丝打开时，当所需的操作模式要求第一个保险丝保持完好时，第一个保险丝断开电路被禁用以防止意外打开第一个保险丝。

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