Oscillation circuit and electronic circuit, and semiconductor device, timepiece, and electronic device equipped with the same

摘要

An oscillation circuit is driven at reduced power by a constant voltage Vreg having an absolute value that is lower than that of a power voltage VSS of a main power source. An electrostatic protective circuit provided in this oscillation circuit is connected between a signal path and this constant voltage Vreg. It comprises a first electrostatic protective circuit portion that causes any electrostatic voltage of a first polarity that invades the signal path to be selectively diverted through a diode to the constant voltage Vreg side of the circuit, and any electrostatic voltage of a second polarity that invades the signal path to be selectively diverted through another diode to the ground side. This ensures that the oscillation circuit is not affected by fluctuations in the power voltage from the main power source, enabling it to oscillate at a stable frequency. <IMAGE>