BCD Counter Circuit using the 74LS90 Decade Counter Electronics Tutorial about the BCD Counter Circuit and the 4-bit 74LS90 BCD Counter which can count from 0 to 9 or cascade together with other BCD counters. BCD Counter State Diagram. Our circuit shows a simple 0 to 9 digital counter using a 74LS90 BCD Counter and 0-60 Counter, with Start/Stop and Reset functions. | All 0-60 Counter, with Start/Stop and Reset functions. Thread starter kirinoarashi; Start date Nov 6 such as a Start/Stop and a Reset/Stop function. I have done a circuit which is able to count from 0-59, and can recycle. The reset button is also working fine. However, upon adding the Start/Stop MOD-60 counter with stop/start and reset Synchronous Counter and the 4-bit Synchronous Counter Then as there is no inherent propagation delay in synchronous counters, because all the counter stages are triggered in parallel at the same time, the maximum operating frequency of this type of frequency counter is much higher than that for a similar asynchronous counter circuit. 4-bit Synchronous Counter Waveform Timing Diagram Seven-7-Segment Counter Circuit with LED Display-Diagram Seven Segment Counter Display Circuit Description. Here is the circuit diagram of a seven segment counter based on the counter IC CD 4033. This circuit can be used in conjunction with various circuits where a counter to display the progress adds some more attraction.