Device for detecting abnormality of clock signal
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 22, 2002
Grant Date -
Jan 24, 2002
app pub date -
May 16, 2001
filing date -
May 17, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for detecting abnormality of a subject clock signal, includes a frequency dividing circuit for frequency-dividing a monitoring clock signal to provide a frequency-divided monitoring clock signal; a shift register which stores the frequency-divided monitoring clock signal in synchronization with the subject clock signal; and a plurality of abnormality evaluation circuits. The abnormality evaluation circuits operate complementarily each other in accordance with an output signal of the shift register and detect abnormality of the subject clock signal for a period of time corresponding to the cycle of the monitoring clock signal.
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