According to some embodiments, an electronic circuit comprises a digital output which is held to a logic one after the power supply was removed, for a time duration in a narrow range. The electronic circuit comprises a first array of elements comprising capacitors and discharging devices (diodes or transistors). A time constant detector detects which elements has the discharging time closest to the target. A second array of elements also comprises capacitors and discharging devices, with discharging durations proportional to the discharging durations of the first array. A decoder charges the appropriate element from the second array. After the power is removed, this charged element starts to discharge. During the discharge duration, a comparator outputs a logic one, and a logic zero after the discharge is completed.