# What is the tradeoff between a low and high tolerance in a processor?

For example, There're 2 processors in which voltages of 1 signals are 1.0 volt. Manufacturer A make it so that 0.95+ to 1.00 volt is also considerd 1, while manufacturer B make the same processor recognize 0.9+ to 1.00 volt as 1. What is the trade off between the two?

Bonus question: Also, are there official names for 1-signal's voltage and 0-signal's voltage?

• Vih and Vil are the terms often used in datasheets to specify the high and low level inputs. – Colin Aug 4 '17 at 8:13
• What bonus do I get if I answer the second homework question? – Chu Aug 4 '17 at 10:24

Typical trade-offs associated with higher $V_{ih}$ and $V_{il}$ margins are longer required setup and hold times. For example, the same chip which needs 5us to sample a voltage of 0.95V as logical "1" may require 7us to sample 0.9V.