High voltage tolerant off chip driver circuit

Details High voltage tolerant off chip driver circuit High voltage tolerant off chip driver circuit

2007-07-03

2007-07-03

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S056000, C326S057000, C326S082000

Reexamination Certificate

active

11107607

ABSTRACT:
An off chip driver circuit includes a pre-driver circuit and a driver circuit. Driver data and enable inputs are decoded in the pre-driver circuit to provide independent inputs to pull up and pull down transistors in the driver circuit. The enable input keeps the driver circuit in the active or high impedance modes. A feedback signal generated by the driver output and the driver enable signals controls an inverter circuit within the driver circuit to provide proper biasing conditions at the gate of the pull up transistor. This feed back provides fast switching times for the driver circuit and prevents gate oxide of all the transistors from being overstressed by the external high voltage signal.

REFERENCES:
patent: 5396128 (1995-03-01), Dunning et al.
patent: 6323684 (2001-11-01), Oshima

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