Static information storage and retrieval – Read/write circuit – Having fuse element
Patent
1994-03-31
1996-05-14
Nelms, David C.
Static information storage and retrieval
Read/write circuit
Having fuse element
365200, 365201, 326 10, 326 16, 326 38, 327525, 327526, G11C 700
Patent
active
055174558
ABSTRACT:
Fuse circuitry is presented which emulates fuse blowing in a temporary manner. As an embodiment, redundant elements of an integrated circuit may be enabled and/or tested prior to laser repair through the use of non-destructive fuse circuitry which emulates fuse blowing. An integrated circuit has a plurality of addressable elements and a plurality of redundant elements, which may be used to replace defective addressable elements. Each redundant element has a non-destructive fuse circuit associated with it which may be used to enable and/or test the redundant element prior to laser repair by emulating the blowing of a fuse contained in the non-destructive fuse circuit. The non-destructive fuse circuit is comprised of a fuse connected to a control logic element, such as an inverter, wherein the control logic element is in turn controlled by a test signal. Emulation of blowing the fuse or not blowing the fuse is accomplished by the logic level of the test signal. So, rather than connecting the fuse to a power supply, the fuse is connected to the control logic element which is controlled by the test signal. Thus, non-destructive enabling and testing of a redundant element prior to laser repair may be accomplished by emulating blowing or not blowing of the fuse through the control logic element. The fuse can then be permanently blown if desired.
REFERENCES:
patent: 5204559 (1993-04-01), Deyhimy et al.
patent: 5206583 (1993-04-01), Dawson et al.
patent: 5361001 (1994-11-01), Stolfa
McClure David C.
Slemmer William C.
Jorgenson Lisa K.
Larson Renee M.
Nelms David C.
Robinson Richard K.
SGS-Thomson Microelectronics Inc.
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