This timer circuit draws only 3 µA of current, and can be powered by DC supplies ranging from 3 V to 15 V. The circuit produces accurate pulses whose time can easily be adjusted, based on the R1 × C1 time constant. The time should not change, even as the supply voltage varies. With the components shown, the circuit generates a one second pulse, triggered by a short positive pulse at the input. The circuit uses a CD4013 flip/flop and a TLV3701 voltage comparator. Unlike a classic 555 timer circuit, this circuit draws a hundred times less current.
