Eingangsschaltung und diese enthaltende integrierte Schaltung

摘要

The disclosed input circuit incorporated in an semiconductor integrated circuit device will not be operated erroneously due to fluctuations of a supply (or reference) potential (VDD) caused by noise, for instance. The input circuit comprises: a signal input terminal for applying an external input signal (Vin); a first input potential detecting circuit (1) for comparing a potential of the input signal with a predetermined supply (or reference) potential (VDD) to detect a potential difference between the two; a second input potential detecting circuit (2) activated in response to a control signal (C), for comparing the potential of the input signal (Vin) with the predetermined supply (or reference) potential (VDD) to detect the potential difference between the two; a delay circuit (3) for delaying an output of the first input potential detecting circuit by a predetermined delay time; a latch circuit (4) for inputting an output signal of the delay circuit as data and an output signal of the second input potential detecting circuit as a clock, to generate an output signal (Vout) according to potentials of these two inputted signals; and a signal output terminal for outputting the output signal of the latch circuit.