发明名称 |
CIRCUITS ASSOCIATED WITH FUSIBLE ELEMENTS FOR ESTABLISHING AND DETECTING OF THE STATES OF THOSE ELEMENTS |
摘要 |
An identification circuit for establishing and sensing the state of a fusible element used in on chip identification of the chip's type comprising: a circuit establishing control signals for turning the identification circuit on and off; dual paths energized by the control signals generated by the level setting circuit to energize one path through the fusible element to provide a state level and the other path through a reference path which provides a reference voltage level which is distinguishable from both the blown and unblown states of the fusible element; a differential sensing circuit for comparing the reference voltage level to the state level to provide a signal indicating the state of the fusible element; and protection circuitry to protect the circuit during an operation in which the state of the fusible element is set.
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申请公布号 |
US2005225375(A1) |
申请公布日期 |
2005.10.13 |
申请号 |
US20040820092 |
申请日期 |
2004.04.07 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
ANDERSON MARK E.II;IYER SUNDAR K.;KOTHANDARAMAN CHANDRASEKARA;MACIEJEWSKI EDWARD P.;SMITH GEORGE E.III |
分类号 |
G11C17/16;G11C17/18;H01H37/76;(IPC1-7):H01H37/76 |
主分类号 |
G11C17/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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