Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1991-02-01
1993-03-30
Miska, Vit W.
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
371 62, G04F 800, G06F 1130
Patent
active
051990075
ABSTRACT:
A compact watch dog timer circuit which includes a pulse period determining circuit (1) for generating a timer reset pulse if a period of an input pulse from an external machine falls within a tolerance range or beyond an upper limit of the tolerance range and no timer reset pulse if the period falls below a lower limit of the tolerance range; and a timer (2) for generating a signal for restoring the external machine to a predetermined condition when no timer reset pulse is fed from the pulse period determining circuit within a timer period which is set corresponding to the tolerance range.
REFERENCES:
patent: 4538273 (1985-08-01), Lasser
patent: 4586179 (1986-04-01), Sirazi
patent: 4763296 (1988-08-01), Gercekci
patent: 4796211 (1989-01-01), Yokouchi
patent: 4809280 (1989-02-01), Shonaka
patent: 5081625 (1992-01-01), Rhee et al.
Miska Vit W.
Zexel Corporation
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