Patent ID: 7271624
Filing Date: 2007-09-18
Classification: G01R,H03K

Abstract:
1. An input power supply voltage level detection circuit, comprising: a voltage input providing a voltage input signal; a ground; a main detector core, coupled to the voltage input and to the ground, that receives the voltage input signal and outputs a first output signal at a main detector core output; a first inverter, coupled to the voltage input and to the ground, that receives the voltage input signal and the first output signal, and outputs a second output signal at a first inverter output; a second inverter, coupled to the voltage input and to the ground, that receives the voltage input signal and the second output signal, and outputs a third output signal at a voltage output that is substantially equal to one of the voltage input signal and the ground, depending on whether the voltage input signal has reached a threshold voltage; and a hysteresis input that provides a hysteresis input signal to the main detector core, wherein the hysteresis input is tied to one of the voltage input and the ground, and wherein the threshold voltage has a higher value when the hysteresis input is tied to the voltage input than when the hysteresis input is tied to the ground.