Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2006-01-10
2006-01-10
Ton, My-Trang Nu (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
Reexamination Certificate
active
06985019
ABSTRACT:
A selectively enabled clamp circuit for limiting voltage overshoot on an input/output (I/O) pin of an associated integrated circuit (IC) device includes a single discharge transistor and a select circuit. The single discharge transistor is connected between the I/O pin and ground potential, and the select circuit is coupled to the I/O pin and includes an input to receive an enable signal and an output coupled to a gate of the signal discharge transistor. For some embodiments, the select circuit includes a level shifter circuit and a voltage detection circuit.
REFERENCES:
patent: 6031408 (2000-02-01), Flannagan
patent: 6057717 (2000-05-01), Kawano et al.
patent: 6078487 (2000-06-01), Partovi et al.
patent: 6865116 (2005-03-01), Kim et al.
patent: 6897703 (2005-05-01), Hunt
Cline Ronald L.
Zhang Ping
Zhou Shi-dong
Liu Justin
Nu Ton My-Trang
Paradice, II William L.
Xilinx , Inc.
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