| 摘要 |
<p>PURPOSE:To match an input/output interface without increasing the number of power supply terminals in the case of use at a system to be operated at plural various power supply voltages. CONSTITUTION:A voltage drop circuit 6 is provided to drop a power supply voltage Vcc supplied to a power supply terminal Tvp only for a prescribed level and to supply it to an output step circuit 3. A program circuit 4 is provided to output a signal at first or second level according to the state of a program element (Rp41). A switching circuit 5 is provided to be turned on/off according to the output signal of this program circuit 4 and to be connected in parallel to the voltage dropping circuit 6.</p> |
