Clock stop detector

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit

Reexamination Certificate

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Details

C365S233100, C365S191000, C327S026000, C327S175000

Reexamination Certificate

active

07545192

ABSTRACT:
A clock stop detector for a memory comprises a first switch that closes in response to a first logic level of a clock signal to charge a capacitor, a second switch that closes in response to a second logic level of the clock signal to discharge the capacitor, and a logic circuit that outputs a control signal based on an inverted clock signal and a charge on the capacitor.

REFERENCES:
patent: 4230958 (1980-10-01), Boll et al.
patent: 5517144 (1996-05-01), Nakashima
patent: 5606531 (1997-02-01), Moroni et al.
patent: 5841299 (1998-11-01), De
patent: 6246614 (2001-06-01), Ooishi
patent: 6381188 (2002-04-01), Choi et al.
patent: 6552578 (2003-04-01), Cheung et al.
patent: 6649476 (2003-11-01), Forbes
patent: 6686802 (2004-02-01), Maeda
patent: 2006/0052962 (2006-03-01), Shipton et al.

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