This paper introduces a quick design method by which any Mod-N asynchronous counter, especially the very large modulus N Counter, is made simple and easy in design.

This paper introduces the process of logic design of digital circuits, and mainly explains the function of asynchronous counter and decoder. The digital clock is an example of this application.

This paper analysis the errors of experimental circuit on a asynchronous decimal carry counter, introduces a typical circuit on a asynchronous decimal carry counter.