Question
Download Solution PDFRace Around condition can be avoided in Digital logic circuits using _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Race around can be avoided by using a Master-Slave Flip-flop as shown:
Working of Master-Slave flip flop
1) When CLK = High, the Master will be active and the slave will be inactive.
Feedback values don’t change as slave flip flop is inactive. Due to this Master output Toggles only once in one clock pulse.
2) When CLK = low, the latest master outputs are transferred to slave inputs and output is obtained. That is slave output change only once in one clock pulse.
3) Master-Slave JK flip flop is similar to the negative edge triggered flip flop
4) Master-Slave JK flip flop also can be converted to positive edge-triggered as shown
Race around condition (RAC)
Race around condition occurs only in level-triggered flip flop. In this, even though input is constant, output continuously toggles and changes for some time continuously.
This is explained as shown:
RAC occurs is when J = 1 and K = 1 [flip flop in toggling mode] and tp > tff
Output toggles many times instead of once in one clock pulse. It is undesirable and called as “Race Around Condition”.
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