Patent ID: 7489167

Claim:
A voltage detection and sequencing circuit for applying a plurality of voltages to an electrical system in a predetermined sequence, comprising: a plurality of subsystems each adapted to detect one of said plurality of supply voltages at an input terminal and to supply said one supply voltage to at least one output terminal in a predetermined sequence as controlled by a sequencing means; wherein each subsystem produces a control signal when said one supply voltage supplied to the input terminal is above a predetermined threshold and each subsystem comprises at least one pass device that under control of at least one of said control signal and said sequencing means couples said input terminal to said at least one output terminal; and said sequencing means comprises at least one logic gate located within at least each of said subsystems other than the subsystem required to provide the one supply voltage first in said predetermined sequence, said logic gate adapted to receive as input signals a plurality of said control signals to produce an output signal to enable said at least one pass device of said subsystem in which said logic gate is located to be turned on in said predetermined sequence.