Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Fusible link or intentional destruct circuit
Patent
1992-09-04
1995-05-23
Westin, Edward P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Fusible link or intentional destruct circuit
326 38, H01H 3776
Patent
active
054184878
ABSTRACT:
A fuse state sense circuit includes a fusible link (40) that is disposed between a node (38) and ground. A programming/sense pad (42) is provided to allow voltage to be applied to the node (38) external to the fuse state sense circuit. Current is provided to the node (38) through a current source (30) and a transistor (36). The transistor (36) is controlled by a bias current. An output node (32) is disposed between the current source (30) and the transistor (36). This is connected to the output through an inverter (34). In operation, the voltage on node (38) is raised to a first level to turn off transistor (36) to allow the output to be exercised and to change the state thereof to emulate the fusible link (40) being open. In a second and programming mode, the voltage on the node (38) is raised to a much higher level to allow sufficient current to flow through fusible link (40) to open it. Transistor ( 36) in this mode is rendered non-conductive and isolates the node (38) from the remaining portion of the circuit.
REFERENCES:
patent: 4446534 (1984-05-01), Smith
patent: 4608530 (1986-08-01), Bacrania
patent: 4686384 (1987-08-01), Harvey et al.
patent: 4730129 (1988-03-01), Kunitoki et al.
patent: 5173616 (1992-12-01), Hinooka
Benchmarg Microelectronics, Inc.
Howison Gregory M.
Santamauro Jon
Westin Edward P.
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