Compact fail safe interface and voting module including the comp

Details Compact fail safe interface and voting module including the comp Compact fail safe interface and voting module including the comp

1992-07-20

1995-04-04

Nguyen, Hoa T.

G06F 1300, H03L 102

Patent

active

054044979

ABSTRACT:
A compact fail safe interface includes an astable multivibrator ring type oscillator that includes an odd number of inverting components. Power supply inputs of the inverting components of the oscillator constitute functional inputs to the interface. In the event that one of the inputs is not correctly supplied, the oscillator generates a continuous safe state output signal. The interface is particularly suited for use with voting modules designed to increase both the safety and the availability of an installation.

REFERENCES:
patent: 3824408 (1974-07-01), Brunel
patent: 3900746 (1975-08-01), Kraft et al.
patent: 4283690 (1981-08-01), Tarbouriech
patent: 4743782 (1988-05-01), Nelson et al.
patent: 5180995 (1993-01-01), Hayashi et al.
patent: 5208553 (1993-05-01), Rice
Sands and Mackenrotts, "Encyclopedia of Electronic Circuits" Signal Generation Circuits, pp. 249-273.
Fletcher, "Clock and Oscillators", An Engineering Approach to Digital Design, textbook, pp. 297-302, published 1980.

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