Redundancy control circuit employed with various digital logic s

Details Redundancy control circuit employed with various digital logic s Redundancy control circuit employed with various digital logic s

1990-02-02

1991-08-06

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

3072021, 307219, 307441, 371 81, 365200, 377 68, H01H 3776, G06F 1116

Patent

active

050383680

ABSTRACT:
A redundancy circuit that substitutes a redundant circuit element for a corresponding defective circuit element includes a severable fuse link and a redundancy control circuit with an input connected to the severable fuse link and first and second outputs. When the fuse link is intact, the first output of the redundancy control circuit is in a first state and the second output is in a second state. When the fuse link is severed, a momentary signal on power up places the first output in the second state and the second output in the first state. The first output is coupled to the one circuit element and the second output is coupled to the corresponding redundant circuit element. If the one circuit element is defective, it is disabled by severing the fuse link.

REFERENCES:
patent: 4613959 (1986-09-01), Jiang
patent: 4614881 (1986-09-01), Yoshida et al.
patent: 4641285 (1987-02-01), Sasaki et al.
patent: 4714839 (1987-12-01), Chung
patent: 4775976 (1988-10-01), Yokoyama
patent: 4849657 (1989-07-01), Boisevert
IBM Tech. Disclosure Bul., vol. 20, No. 4 (9-1977), "Fuse State Detector & Inverter", by Thoma.

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