Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1995-06-02
1997-04-08
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327198, 327 42, H03K 1720, H03K 700
Patent
active
056191553
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.
REFERENCES:
patent: 4024414 (1977-05-01), Gurry
patent: 4886983 (1989-12-01), Taka
patent: 5371417 (1994-12-01), Mirov et al.
Callahan Timothy P.
Le Dinh T.
United Microelectronics Corporation
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