SEMICONDUCTOR INTEGRATED CIRCUIT

摘要

PURPOSE:To obtain a data holding circuit where data is not held because of the disconnection of a feedback loop by providing a double feedback loop. CONSTITUTION:A data is inputted to an inverter train 1 by opening a transfer gate 5 for data input to the data holding circuit in the state that a transfer gate 3 for holding data is closed. The held data of an output section 7 is fed back to an input section 6 via a feedback loop 2 by opening the gate 3 at the same time when the gate 5 is closed to keep stably a parasitic capacitor 4 to a state decided by the held data. Since the held data is fed back via a diffusion resistor 9 when the input part of the gate 3 and the feedback loop 2 are disconnected at the data holding the charge in the parasitic capacitor 4 is not discharged and the data is kept held. When the diffusion resistor 9 is disconnected, the data is held via the feedback loop 2.