Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-09-06
2005-09-06
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C307S064000, C307S086000
Reexamination Certificate
active
06940334
ABSTRACT:
Methods and systems for protecting integrated circuits (“ICs”) from power-on sequencing problems provide an interim voltage during power-on sequences in order to prevent over-voltage conditions across IC terminals. Voltages at first and second terminals of a circuit are monitored and an interim voltage to the second terminal is provided when the voltage at the first terminal exceeds a first threshold and a voltage at the second terminal is below a second threshold. The interim voltage protects the circuit from excessive voltage differences across the first and second terminals during power-on sequences, and is deactivated during normal operation so as not to draw excessive current. The method/system helps to insure that multi-supply dependent logic and/or other circuitry does not receive inappropriate voltage levels, and thus helps to insure that lower voltage level based circuitry is not damaged during power-up, transients, and/or glitches.
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patent: 6671146 (2003-12-01), Hashimoto et al.
patent: 2003/0038668 (2003-02-01), Wada
Copy of International Search Report from PCT Application No. PCT/US03/04865, filed Feb. 21, 2003, 6 pages (search report mailed Sep. 22, 2003).
Broadcom Corporation
Callahan Timothy P.
Englund Terry L.
Sterne Kessler Goldstein & Fox PLLC
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