Digital operate/release timer

Details Digital operate/release timer Digital operate/release timer

H - Electricity

03

K

328/188

H03K 5/00 (2006.01) H03K 5/135 (2006.01)

Patent

CA 1131717

DIGIAL OPERATE/RELEASE TIMER Abstract of the Disclosure Operate/release timing circuits are employed to generate time delayed pulse signals employed, for example, in telecommunications signaling systems. Pulse position and pulse width errors and other problems are resolved by employing a single digital counter and associated control logic elements. Input signal pulse break, gap and the like immunity is achieved by controlling the counter to count up for a predetermined interval regardless of the presence or absence of the input pulse signal. Once a valid input pulse has been detected and is terminated, a timer output change of state is delayed for a so-called release delay interval. Once the pulse signal has terminated for a predetermined integrated interval, the counter is controlled to continue counting down until the initial condition is reached regardless of the presence or absence of the input pulse signal.

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