``Ideally Fast´´ Decimal Counters with Bistables

The counting speed is taken as the most important factor in the selection of decimal counter logical arrangements. Decimal counter arrangements with the counting speed equal to that of the basic bistable, termed ``ideally fast,´´ are considered. The methods for making ``ideally fast´´ counting logics are outlined. A number of ``ideally fast´´ decimal counter arrangements with weighted and un-weighted codes are presented and their features are discussed.