S.T.T. design of asynchronous sequential counters using ‘unit’ machines
R. M. H. Cheng, K.O. Okpere · Electronics Letters · 1970
A systematic procedure for the parallel cascading of asynchronous counters (referred to as ‘unit’ machines) is proposed as a method of realising, in a single-transition-time (s.t.t.) manner, an asynchronous counter of any code.