Method and circuit for improving device power up timing and predictability

摘要

Method and system for controllably and sequentially powering up subsystems of an electronic system, device or integrated circuit. In one example, a first supply voltage is selectively applied to a first subsystem, and when the first supply voltage has reached a predetermined value, a second supply voltage is selectively applied to the second subsystem. The first and second supply voltages may also be boosted to provide fast startup timing. In this manner, the first subsystem is powered-up before the second supply voltage is applied to the second subsystem—this provides for controlled, sequential power up of the subsystems of the electronic system, device or integrated circuit.