Patent ID: 6636089
Filing Date: 2003-10-21
Classification: H03K

Abstract:
A detection device for an integrated circuit comprising a core and interface circuits connected to the core for providing output signals therefrom, the detection device for detecting a level of a core supply voltage applied to the core with respect to a level of an interface supply voltage applied to the interface circuits, with the interface supply voltage being higher than the core supply voltage, the detection device comprising:an input stage connected to the core supply voltage and to the interface supply voltage for providing a detection signal to the interface circuits for setting outputs thereof to a high impedance state when a level of the core supply voltage is too low to enable operation of the core, said input stage comprising an inverter controlled by the core supply voltage; and a power supply stage comprising at least one diode and a capacitor connected thereto, said power supply stage being connected between the interface supply voltage and said input stage for providing the interface supply voltage thereto.