Antifuse programming, protection, and sensing device

Details Antifuse programming, protection, and sensing device Antifuse programming, protection, and sensing device

2007-06-26

2007-06-26

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Fusible link or intentional destruct circuit

C365S225700

Reexamination Certificate

active

11252180

ABSTRACT:
An antifuse programming, protection, and sensing device incorporates a control circuit to program and protect an antifuse. The antifuse, which is initially constructed as a low conductivity path, is programmable to a high conductivity path by application of an elevated voltage across terminals of the antifuse. Application of 0 volts to the VDDnode of a conduction control portion of the antifuse programming, protection, and sensing device allows an elevated voltage for programming to be applied to the antifuse. Upon application of a nominal working voltage to the VDDnode of the conduction control circuitry, the antifuse and an adjoining sense amplifier circuit are protected from overvoltage and tampering. The sense amplifier supplies a sense current to the antifuse, measures a voltage at an input to the antifuse, and determines a programmed state if a measured voltage level is low.

REFERENCES:
patent: 5418487 (1995-05-01), Armstrong, II
patent: 5731733 (1998-03-01), Denham
patent: 5789970 (1998-08-01), Denham
patent: 6426668 (2002-07-01), Morrish et al.
patent: 6618311 (2003-09-01), Becker
patent: 6628561 (2003-09-01), Van De Graaff
patent: 6762819 (2004-07-01), Lee
patent: 2003/0234665 (2003-12-01), Smith et al.

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