| 摘要 |
PURPOSE:To enable to apply a high voltage to an input terminal by applying a voltage divided by a resistor or a transistor from the input terminal of an integrated circuit to an input gate. CONSTITUTION:The input terminal 1 of an integrated circuit is grounded through voltage dividing resistors R1, R2, and the intermediate point M is connected to the input terminal of an MOS inverter 2 of the integrated circuit. If R1, R2 are set so that 'H' level applied to the inverter 2 comes to VDD, where a power source voltage of the circuit is VDD, an input voltage is Vin, and resistances are R1, R2, when the input is fluctuated at 0-Vin, the level of the M point is fluctuated between 0 and the VDD, and the inverter 2 becomes similar to the normal operation, and even if a high voltage is applied to the input, it can be operated. |
