Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Signal transmission integrity or spurious noise override
Patent
1998-05-21
2000-05-23
Kim, Jung Ho
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Signal transmission integrity or spurious noise override
327589, H03K 1716
Patent
active
060669772
ABSTRACT:
A circuit for providing programmable voltage output levels in a logic device includes a pull-up device for driving an output pad with either a first voltage output level or a second voltage output level. A charge pump generates a pumped voltage. A first clamp regulator, coupled to the charge pump and the pull-up device, receives a first reference signal. The first clamp regulator, in response to the first reference signal, generates a first voltage from which the first voltage output level is derived. A second clamp regulator, coupled to the pull-up device, receives a second reference signal. In response to the second reference signal, the second clamp regulator generates a second voltage from which the second voltage output level is derived. A passgate multiplexer is coupled to the first and second clamp regulators. The passgate multiplexer receives at least one output voltage select signal. In response to the at least one output voltage select signal the passgate multiplexer selects either the first voltage output level or the second voltage output level.
REFERENCES:
patent: 5241502 (1993-08-01), Lee et al.
patent: 5268600 (1993-12-01), Yeu
patent: 5467054 (1995-11-01), Ikeda
patent: 5594380 (1997-01-01), Nam
patent: 5621348 (1997-04-01), Furutani et al.
Camarota Rafael C.
Chan Albert
Felton Bradley
Shen Ju
Tsui Cyrus Y.
Kim Jung Ho
Lattice Semiconductor Corporation
Woo, Esq. Philip W.
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