| 摘要 |
PURPOSE:To obtain a semiconductor integrated circuit where analog and digital circuits exist in mixture with less characteristic deterioration by providing an accessory circuit activating sequentially logic circuits connected in parallel by a number depending on the capacitance of a load capacitor. CONSTITUTION:When the level of a terminal 3 changes from a logical high to a logical low level, the output of an inverter 11 is subjected to the change from the low to the high level of an inverter 2 and goes from the high to the low level so as to discharge the electric charge of the load capacitor 5. After the logical delay of inverters 13, 14 of the accessory circuit, the input level of the inverter 12 goes from the low to the high level. Then the output of the inverter 12 goes from the high to the low level and the electric charge in the load capacitor 5 is discharged in parallel with the inverter 11. Then the discharge is started by the inverter 11 and then the inverters 11, 12 apply discharging, thereby reducing noise due to the discharge to nearly a half.
|
