Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Fusible link or intentional destruct circuit
Patent
1996-10-15
2000-07-11
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Fusible link or intentional destruct circuit
327 51, 326 38, H02H 720
Patent
active
060878894
ABSTRACT:
A fuse circuit for a semiconductor device allows the device to be adjusted after fabrication by selectively blowing a fuse in response to a fuse control signal. The circuit is fabricated on the semiconductor device and includes a fuse, an enable circuit for blowing the fuse in response to the fuse control signal, and a sensing circuit for sensing the state of the fuse. A comparison signal generator can be coupled to the fuse to generate two comparison signals that are compared by a differential comparator which generates an output signal indicative of the state of the fuse. The comparison signal generator is coupled to the fuse and includes a resistive voltage divider which generates the comparison signals by dividing a power supply voltage signal. If the fuse is blown, the first comparison signal is at a higher voltage level than the second comparison signal, and a comparator in the sensing circuit generates an output signal having a low logic level to indicate that the fuse is blown. If the fuse is not blown, the first comparison signal is at a lower voltage level than the second comparison signal, and the comparator generates an output signal having a high logic level to indicate that the fuse is not blown. A detector circuit which includes a voltage sensing resistor can be coupled between the comparison signal generator and the fuse to allow the circuit to detect a blown fuse which is not completely blown, but has a high enough resistance to be considered blown.
REFERENCES:
patent: 4223277 (1980-09-01), Taylor et al.
patent: 5345110 (1994-09-01), Renfro et al.
patent: 5404049 (1995-04-01), Canada et al.
patent: 5420456 (1995-05-01), Galbi et al.
patent: 5731760 (1998-03-01), Ramirez
Callahan Timothy P.
Nguyen Hiep
Samsung Electronics Co,. Ltd.
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