Abstract: A bistable circuit comprises a flip-flop including at least one clock input, and a plurality of data inputs at least one of which is supplied with a signal at a timing independent of clocks applied to the clock input. The flip-flop also includes first and second outputs. First and second insulated gate field effect transistors are series-connected between the first output of the flip-flop and a predetermined voltage terminal. The first transistor is connected to receive at its gate a signal indicative of the condition of a selected one of the two outputs of the flip-flop, and the second transistor is connected to receive at its gate a control signal. When the selected one of the outputs assume an intermediate voltage, the first transistor is rendered conductive. In addition, the second transistor is rendered conductive in response to the control signal.