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How to determine slew trip point

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owen_li

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Hi
As we know, in deep sub-micron design, we usually model the slew ( transition time) between the trip points 30% to 70%. It is said that it will lost some accuracy when using the trip points fro 10% to 90%. Could you tell the cause why using the trip points from 30% to 70% ？ Is there any document or material talking about this topic ?
Thanks very much!
 

Hi,

there are reat differences in slew trips,is it 10-90 or 20-80 or 30-70 as you mentioned ?
 

cyrax747 said:
Hi,

there are reat differences in slew trips,is it 10-90 or 20-80 or 30-70 as you mentioned ?
Click to expand...

Yeah. we usually use 30-70 as the trip measure points to characterize the slew number in timing library. But I do not know why select such pair of points to model the transtion time.
Thanks!
 
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