IC-chip operation inhibitor
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United States of America Patent
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-
Apr 8, 1997
Grant Date -
N/A
app pub date -
Jun 2, 1995
filing date -
Jun 2, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An IC chip operation inhibitor to prevent operation of an IC chip in a system having a clock rate that exceeds a predetermined reference clock rate for the chip. The inhibitor has a frequency detecting device that generates at least one reference frequency. It compares the system clock with the reference frequency and prevents the chip from operating if the system clock frequency is greater than the reference frequency. The invention includes an external actuating device coupled to the frequency detecting device for generating a compare enable signal to actuate the comparing function of the frequency detecting device, and for generating a frequency select signal for selecting one of the built-in reference frequencies to be compared with the system oscillating frequency. The external actuating device may be turned off in order not to actuate the comparing function of the frequency detecting device when it is sure that the system oscillating frequency will not be higher than the reference frequency.
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