Patent ID: 8035426

Claim:
A device including a power-on reset generator, comprising: a threshold level shifter configured to shift an input electrical signal to a switch voltage value; a power-on detector including a plurality of voltage-shaping elements that are arranged in series, each voltage-shaping element having a threshold voltage value, and being configured to have a pair of unbalanced transistors, one of the pair being stronger transistor than the other, the stronger transistor alternately pulls-up and pulls-down a voltage level of an electrical signal, wherein the power-on detector is configured to output a digital signal and configured to switch the digital signal to a predetermined value during a switching event; a switch that locks the digital signal at the predetermined value during the switching event, wherein the switching event occurs when the switch voltage value exceeds the threshold voltage value of one of the voltage-shaping elements; and a digital delay configured to receive the digital signal and a clock signal, and de-assert a reset signal at a predetermined time delay after the digital signal reaches the predetermined value.