Patent ID: 6157227
Filing Date: 2000-12-05
Classification: H03K

Abstract:
An information handling system comprising a neutralization device for selectively inhibiting at least one electronic function in an integrated circuit, as a function of the level of a supply voltage applied to said integrated circuit, the neutralization device comprising:a voltage reference circuit coupled between a supply voltage and a connecting point;a current biasing circuit coupled between ground of the integrated circuit and the connecting point;an inverter output stage having an input coupled to the connecting point and an output for providing a neutralization signal for selectively inhibiting the at least one electronic function in the integrated circuit;a conditional feedback circuit comprising a switch series-connected between the current biasing circuit and ground, and a first logic circuit receiving the neutralization signal as a feedback signal and a first control signal as a conditional signal, the first logic circuit outputting a second control signal applied to the switch so as to activate or deactivate the current biasing circuit; anda second logic circuit for providing the first control signal based on the current mode of operation of the integrated circuit so as to activate the current biasing circuit at least while a write operation is being performed in a memory of the integrated circuit.