Asynchronus Up and Down Counter

174

02:13:20

This circuit is an asynchronous up and down counter. It is made asynchronous to lessen propagation delay. Applications of this counter are useful in microprocessor unit. Typically it is used in incrementing registers such as program counter and stack pointer.
Activating logic input at the top will make the counter to count up and activating logic input at the botton will make the counter to count down. We can only activate logic input one at a time. Enjoy.

published 10 years ago

selman

10 years ago

This is a 'synchronous' counter, synchronous counters have less propagation delay because each flip-flop is clocked independently so that you only have to consider the propagation delay of one flip-flop even if the number of bits is large. But in asynchronous counters the propagation delay of the whole circuit Is the propagation delay of one flip-flop multiplied by the number of bits.

Jie

10 years ago

My bad, but still the circuit is an asynchronous counter. I'm just mistaken about its propagation delay time sorry.

selman

10 years ago

Sorry meant to say asynchronous.

oarafa

8 years ago

thanks for sharing.

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