Abstract: An input signal level converter for applying a TTL signal to an actual input of an MOS circuit is required for n-MOS digital circuits controlled with TTL signals. This circuit forms a Schmitt trigger and comprises five MOS field effect transistors and a bootstrap capacitor. The transistors are preferably of the n-channel type and are self-inhibiting. This circuit is improved by means of two further transistors connected such that a quiescent current consumption of the level converter is considerably reduced. Favorable dynamic behavior is achieved without having unfavorable current usage.