Generator of reset pulses upon the rise of the power supply for cmos-type integrated circuits

摘要

The generator comprises an input stage (I) constituted by means for dividing the voltage between the power supply and the ground, having a node constituting the output of the input stage, and by a positive-feedback threshold loop, driven by another node of said divider means to make the voltage in said output node rise sharply when the voltage in said other node exceeds said threshold; a first Schmitt trigger (T1) driven by the voltage rise front supplied by said input stage (I); and a former of output pulses (F) comprising a second Schmitt trigger driven by circuital means adapted to directly apply to the second Schmitt trigger the voltage front arriving from the first Schmitt trigger (T1) and to restore the original voltage level with a preset delay.