Patent ID: 6118315
Filing Date: 2000-09-12
Classification: G01R,G06F,H03K

Abstract:
A power-on-reset circuit in an integrated circuit supplied with a supply voltage, the power-on-reset circuit comprising:voltage-detection circuitry connected to said supply voltage to compare said supply voltage with a voltage threshold and to produce an inhibition signal when said supply voltage is turned on and is less than said voltage threshold and to cease producing said inhibition signal at a first predetermined time after said supply voltage exceeds said voltage threshold, said inhibition signal being applied to an inhibition input of a circuit whose operation is to be inhibited when the power is turned on in the integrated circuit; andvoltage-drop-detection circuitry connected to said supply voltage to detect when said supply voltage drops by at least a determined value even if said supply voltage is above said voltage threshold, and to instantaneously re-trigger said inhibition signal for a second predetermined time each and every time the voltage-drop-detection circuitry detects that said supply voltage has dropped by at least the determined value.