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Digital Circuit Simulator
  Design of BCD counter in DCD
A sequential circuit that goes through a prescribed sequence of states upon the application of input pulses is called a counter. Counters find usage in almost equipments containing digital logic. They are useful for generating timing sequences to control operations in a digital system. An n bit binary counter is created using n flip-flops and can count in binary from 0 to a max of 2n-1.

However, counter designs can be modified to count a binary sequence of less than 2n numbers. The image on the left is an example of BCD counter created using T flip flops which counts the binary sequence from 0000 to 1001 and returns to 0000 to repeat the sequence.

You can download the circuit file for the BCD counter here.

Using the DCD application, it is possible to modularize a circuit and convert it into a packaged integrated circuit. The integrated circuit (IC) can be used as an atomic component to build higher order circuits. To demonstrate the IC feature, I present a higher order circuit (Ripple Counter), which is created by using shrink wrapped BCD counter chips.

Ripple Counter demonstration

 

 

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