Patent ID: 7279943
Filing Date: 2007-10-09
Classification: H03K

Abstract:
1. A circuit arrangement comprising: a first circuit block operating at a first supply voltage, a second circuit block operating at a second supply voltage, wherein the first circuit block is coupled to the second circuit block by a voltage level shifting unit in order to transmit a first activation or deactivation signal to the second circuit block, and a voltage level detector which operates at the second supply voltage and is coupled to the voltage level shifting unit and which can be supplied with the first supply voltage, and which is operable to output a first control signal if the voltage level of the first supply voltage is below a threshold value, wherein the voltage level shifting unit transmits the first deactivation signal to the second circuit block when the voltage level detector outputs the first control signal, and a reset unit which operates at the first supply voltage and is coupled to the first circuit block and which is operable to transmit a reset signal when the first supply voltage is turned on in order to set the first circuit block to a defined initial state.