Patent ID: 8054120

Claim:
An integrated circuit operable in a standby state, comprising: a wakeup terminal configured to receive a wakeup signal; a supply voltage terminal configured to be coupled to a supply voltage; a power control circuit that includes: an enable circuit coupled to the wakeup terminal and configured to receive the wakeup signal from the wakeup terminal and set a voltage monitoring enable signal as a response to the wakeup signal, a voltage monitoring circuit coupled to the supply voltage terminal and including an operation switch configured to be controlled by the voltage monitoring enable signal, wherein the voltage monitoring circuit is configured to determine if the supply voltage is above a threshold voltage and to set a supply voltage level indication signal accordingly, and an enable hold circuit configured to generate an enable hold signal and provide the enable hold signal to the enable circuit, wherein the enable circuit is further configured to set the voltage monitoring enable signal as a response to the enable hold signal; and processing circuitry configured to process an input signal and to switch between a normal operation state and a standby state of the processing circuitry in response to the supply voltage level indication signal.