High speed IO buffer using auxiliary power supply

Details High speed IO buffer using auxiliary power supply High speed IO buffer using auxiliary power supply

2007-11-13

2007-11-13

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S068000, C327S534000

Reexamination Certificate

active

11456569

ABSTRACT:
Circuits, methods, and apparatus that provide output drivers that consume relatively little integrated circuit area and provide fast output switching. An exemplary embodiment provides an output driver including pull-up and pull-down devices, each device driven by a pre-driver stage. The pre-driver for the pull-down device is supplied from an auxiliary power supply, which has a higher voltage than the supply seen by the pull-up device. The pre-driver for the pull-down is biased by a voltage that tracks the higher of the auxiliary and output supplies. In some embodiments, the output driver may be part of an input/output cell. In that case, the well for the pull-up device is biased by a voltage that tracks the highest of the output supply and input received voltage, while the pull-up predriver circuit bias is the higher between the auxiliary and output supplies and the input received voltage.

REFERENCES:
patent: 5128560 (1992-07-01), Chern et al.
patent: 6208167 (2001-03-01), Ranjan et al.
patent: 6369613 (2002-04-01), Costello et al.

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