A semiconductor circuit assembly having capacitively controlled field effect transistors, includes a semiconductor chip containing a digital circuit part for supplying timing pulses for controlling operation of the digital circuit part, and terminal having at least one conductive connection to the digital circuit part and the timing pulse generator for supplying potentials thereto from a direct current source. An oscillator is provided and a substrate-bias generator connected to the oscillator and the timing pulse generator. The substrate-bias generator is controlled by the oscillator for producing a bias voltage able to reach a given full value and for activating the timing pulse generator only after the substrate bias voltage has reached its full value.