Power supply supervisor with independent power-up delays and a system incorporating the same

摘要

A power supply monitoring circuit, and a data processing system incorporating the same together with a regulated power supply and system components such as a CPU, are disclosed. The power supply monitoring circuit includes delay circuits, with the respective delays selected by the selection of capacitor values, for delaying the issuing of a "power- good" signal to the CPU after power-up until sufficient time has passed after establishment of adequate voltages on the power supply bus to allow the power supplies to stabilize, and for ignoring undervoltage faults (in generating a power supply shutdown signal) on said power supplies for a brief period of time after power-up. The stabilization and power-up delay periods may be selected independently from one another, so that the power- up delay can expire prior to the expiration of the stabilization delay. In this way, the power supply can be promptly turned off if an undervoltage condition is present during power-up, reducing the risk of component damage from absence of adequate power supply voltages.