This timer for long time intervals is from the 1990 Motorola Linear Databook. The setting applies to other operational ones and component values are given below the diagram.
Devices Feature Open Immobilizer Protocol for Interoperability and Low Frequency Vector Techniques for...
This circuit is from an American 80's documentation. The integrated circuit is from the time and...
The frequency of TTL square signal is divide by 5 with this circuit. Power supply is 5 V and the...