Microelectronics Journal (2019). [3] A Lock Detector Loop for Low-power PLL-Based Clock and Data Recovery Circuits. Circuits, Systems, and Signal Processing (2017). Back to "Circuits and Systems" ...

This simple alarm timer circuit is made with 4060 which has an integrated oscillator with a good stability with a relatively wide frequency range. In the circuit diagram the oscillator frequency is ...

An internal monitor circuit checks the 9-V battery level at 40-sec intervals during the LED pulse. Checks are made every 24 clock cycles for low battery by comparing Vdd to an internal zener voltage.