Patent ID: 7696649
Filing Date: 2010-04-13
Classification: H03K

Abstract:
1. Power control circuitry for controlling the connection of a voltage source to an associated circuit when that associated circuit is to enter an active state of operation, the associated circuit having a plurality of circuit portions, each said circuit portion having at least one voltage line for connection to the voltage source, the power control circuitry comprising: a series of power switching circuits, each power switching circuit being associated with one of said circuit portions and being provided with an enable signal, each power switching circuit being responsive to its enable signal being set to connect the voltage source to said at least one voltage line of said associated circuit portion; and at least one enable qualifying circuit, each enable qualifying circuit being associated with one of the power switching circuits and generating an output signal used to determine the enable signal provided to a later power switching circuit in the series, each enable qualifying circuit setting its output signal when both the enable signal provided to the associated power switching circuit is set and said at least one voltage line of the circuit portion associated with that power switching circuit has reached a predetermined voltage level.