Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Fusible link or intentional destruct circuit
Patent
1993-11-02
1995-04-04
Westin, Edward P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Fusible link or intentional destruct circuit
326 38, H02H 720
Patent
active
054040493
ABSTRACT:
A chip can be provide with circuits to electrically read, blow and latch fuses. The circuit allows use of existing I/O pads used for other functions on a chip to drastically reduce the number of I/O required to blow fuses. The circuits also share critical high current carrying lines with no impact on fuse functionality and device reliability. By offering of complex fuse operations such as electrical override, even after they had been blown, essential for product screening and product diagnostics. The circuit provides a fuse blow circuit fed by a fuse sense circuit and fuse latch circuit. Stored addresses in an address buffer addresses the fuses with two sets of inputs: one providing electrical override and/or fuse blow information; and the second one, normal fuse status. Fuse integrity before and after blow is maximized with a dual voltage source drive and low current sensing.
REFERENCES:
patent: 4532607 (1985-07-01), Uchida
patent: 4686384 (1987-08-01), Harvey
patent: 4937465 (1990-06-01), Johnson
patent: 5270976 (1993-12-01), Tran
Canada Miles G.
Nicewicz Michael
Rawlins John R.
Rivadeneira Carlos G.
Augspurger Lynn L.
International Business Machines - Corporation
Sanders Andrew
Westin Edward P.
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