An oscillator according to the present invention reduces power consumption by enlarging the pulsewidth of an oscillator output pulse. Since this pulse disables an oscillator current source, the enlarged pulsewidth reduces the time the current source is enabled. When a first capacitor charges to at least a reference voltage, a differential amplifier produces a low level signal that is provided to a latch generating the output pulse. The low level signal controls the latch to produce and maintain a high level signal until the latch is triggered. The latch signal disables the current source, while enabling a transistor to transfer charge from the first capacitor to a second capacitor. When the second capacitor attains a sufficient voltage, the latch is triggered to produce a low level signal, thereby enlarging the pulsewidth of the output pulse. The low level signal enables the current source and facilitates discharge of the second capacitor.