| 摘要 |
PURPOSE:To ensure the assured operation of the device after making of the power switch, by providing an analog switch, CR time constant circuit and others between the 1st output terminal of the 1st sequential counter and the reset input terminal of the 2nd sequential counter. CONSTITUTION:Analog switch 4 comprising C-MOS or the like, the time constant circuit consisting of resistance R1 and capacitor C1 plus resistance R2 are provided between output terminal Q0 of sequential counter 1 and reset terminal R of sequential counter 2. When terminal R of counter 2 becomes L level, the reset input terminal of counter 1 becomes also level L. As a result, the device can be operated assuredly without causing the discontinuation of the counting action in a fixed time after the make of the power switch. |
