need help in the design of power on reset

[incol]

hysteresis power on reset

there is a request in my design that hysteresis of por is 0.07v, what does it mean,is it means delay is 0.07v? what is the use of hysteresis in por ?
thanks

 

[FIGUE]

Mainly the POR hysteresis is used to absorve the variation of the power supply during the power on phase, you will have a threshold value in order to compare to resetout the processor (the power supply is now in stady state) and this comparison has and hysteresis in order to absorve the variation/ripple of the power supply.

I hope to be usefull this comments.

 

[ambreesh]

Hystersis of 75mV means that, when your input goes above threshold by 75mV then only the ouput would go high. Similarly, when input is going down , the output shall chage only when input has gone 75mV below the threshold vlaue
Hope it helps

 

[lunren]

Hystersis of 75mV means that, when your input goes above threshold by 75mV then only the ouput would go high. Similarly, when input is going down , the output shall chage only when input has gone 75mV below the threshold vlaue
Hope it helps

I think POR have a higher threshold and lower threshold, the difference between these two thresholds is the hystersis, right?

 

[ambreesh]

Yes, so around the reference you could devide the 70mV drop, depending on your requirmrnt.