Monitoring system for verifying that an input signal is toggling

Details Monitoring system for verifying that an input signal is toggling Monitoring system for verifying that an input signal is toggling

1985-03-12

1987-10-06

Miller, Stanley D.

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

Applications

Determining machine or apparatus operating time or...

377 76, 307606, G07C 300, G07C 302

Patent

active

046988297

ABSTRACT:
A monitoring system for verifying that an input signal is toggling at a minimum frequency includes an edge detector to provide an output signal in response to a transition in the state of an input signal. The output signal is used to reset a resettable clock. In the event that the output signal is not received during a first reset period a first signal is generated and if there is no output within a second succeeding reset period, a second signal is generated.

REFERENCES:
patent: 3350580 (1967-10-01), Harrison
patent: 3399351 (1968-08-01), Reszka
patent: 3710366 (1973-01-01), Welling
patent: 3903474 (1975-09-01), Wiley
patent: 4144448 (1979-03-01), Pisciotta et al.
patent: 4374361 (1983-02-01), Holden

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