Asynchronous Synchronous Circuit The logic circuit of this type of counters is simple to design and we feed output of one FF to clock of next FF The circuit diagram for type of counter becomes difficult as number of states increase in the counter Propagation Time Propagation time delay of this type of counter […]
Tag: propagation time
Maximum Frequency of the clock signal
To achieve the maximum frequency of the clock signal we can assume to start SETUP time immediately after the CLK to Q delay is finished. This would mean that we can have the next positive edge (CLK to Q delay + SETUP time) after the previous positive edge. And with 50% duty cycle, falling edge […]
Timing parameters of a flip flop
There are basically 3 types of factors which affect the working of a flip flop: 1. Setup Time: This is defined as minimum amount of time required for which an input should be stable just before the clock transition occurs. Suppose we have a positive edged JK flip-flop and setup time is t= 1ns seconds. If […]
Parameters of clock pulses
Note that we need the width of PRESET pulse, CLEAR pulse etc to be greater than some minimum values for proper operation of every flip-flop. This width is measured between 50% transition points of rising and trailing edges of the given signal. Setup and Hold time are measured w.r.t the activating clock edge. The Setup time is the […]