Counter Components

Decade Counters

In the component library we find also two Decade Counters, one BCD 8421 and the other BCD 5421 (bi-quinary).

The illustrative circuit below demonstrates a BCD counter divided in two different section. The one on the left shows a two-digit BCD counter (00..99). The other one has two cascading bi-quinary counters, whose outputs are displayed in binary (click on the image to open the schematic in the Deeds-DcS).

One of the peculiarities of a bi-quinary BCD counter is that the most significant bit shows a 50% duty-cycle wave and a frequency equal to one tenth of that of the clock. The following video shows the interactive simulation of the circuit above.