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Difference between Static-1 and Static-0 hazard

  • Last Updated : 24 Jun, 2021

Static hazard occur in combinational circuits and can be eliminated by using redundant gates. Static hazard is classified as: 

1. Static-1 hazard : 
If the output is currently at logic state 1 and after the input changes its state, at the same moment the output changes to 0 before settling on 1, then it is a Static-1 hazard. 

2. Static-0 hazard : 
If the output is currently at logic state 0 and after the input changes its state, at the same moment the output changes to 1 before settling on 0, then it is a Static-0 hazard. 

 



Difference between Static-1 and Static-0 hazard: 

 

STATIC-1 HAZARDSTATIC-0 HAZARD
Output changes from 1 to 0.Output changes from 0 to 1.
It is false ‘0’ level for a short interval.It is false ‘1’ level for a short interval.
AND-OR circuit produces static-1 hazard.NAND-NOR circuit produces static-0 hazard.
The graph goes from high to low then again high.The graph goes from low to high then again low.
Static-1 hazard with contact networks is a tie set hazard.Static-0 hazard with contact networks is a cut set hazard.
SOP is used for removing static-1 hazard.POS is used for removing static-0 hazard.
We deal with 1s in static-1 hazard.We deal with 0s in static-0 hazard.

 

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