Patent ID: 8773893

Claim:
A system for charging a low voltage power domain in a low power DRAM, the system comprising: a first capacitor, for providing a local domain power voltage supply; a first transistor, coupled to the first capacitor and a voltage supply and turned on by a powerdown signal, the first transistor for decoupling the first capacitor from the voltage supply during powerdown mode according to the powerdown signal, and charging the capacitor to provide the local domain power voltage supply when exiting powerdown mode according to the powerdown signal; a second capacitor directly coupled to the voltage supply; and a second transistor, coupled to the second capacitor, the powerdown signal, and the local domain power voltage supply, for decoupling the second capacitor from the local domain power voltage supply during powerdown mode according to the powerdown signal and coupling the second capacitor to the local domain power voltage supply when exiting powerdown mode according to the powerdown signal; wherein the second capacitor will be coupled to the voltage supply during powerdown mode.