Intel Core i7 Processor I7-940 AT80601000921AA User Manual

Datasheet 

21

The input buffers in both client and host models must use a Schmitt-triggered input 
design for improved noise immunity. Use 

 as a guide for input buffer design.

 specifies absolute maximum and minimum ratings, which lie outside the 

functional limits of the processor. Only within specified operation limits can functionality 
and long-term reliability be expected.

At conditions outside functional operation condition limits, but within absolute 
maximum and minimum ratings, neither functionality nor long-term reliability can be 
expected. If a device is returned to conditions within functional operation limits after 
having been subjected to conditions outside these limits, but within the absolute 
maximum and minimum ratings, the device may be functional, but with its lifetime 
degraded depending on exposure to conditions exceeding the functional operation 
condition limits.

At conditions exceeding absolute maximum and minimum ratings, neither functionality 
nor long-term reliability can be expected. Moreover, if a device is subjected to these 
conditions for any length of time then, when returned to conditions within the 
functional operating condition limits, it will either not function or its reliability will be 
severely degraded.

Although the processor contains protective circuitry to resist damage from Electro-
Static Discharge (ESD), precautions should always be taken to avoid high static 
voltages or electric fields.

Minimum V

P

Maximum V

P

Minimum V

N

Maximum V

N

PECI High Range

PECI Low Range

Valid Input
Signal Range

Minimum
Hysteresis

V

TTD

PECI Ground