Intel 1.40 GHz RH80532NC017256 Data Sheet

24 Datasheet

 

298517-006 

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The VTTPWRGD signal is an input to the processor used to determine that the VTT power is stable and 
the VID and BSEL signals should be driven to their final state by the processor.  To ensure the processor 
correctly reads this signal, it must meet the following requirement while the signal is in its transition 
region of 300 mV to 900 mV.  Also, VTTPWRGD should only enter the transition region once, after 
VTT is at nominal values, for the assertion of the signal. 

Amount of noise (glitch)  

Less than 100 mV 

In addition, the VTTPWRGD signal should have reasonable transition time through the transition region.  
A sharp edge on the signal transition will minimize the chance of noise causing a glitch on this signal. 
Intel recommends the following transition time for the VTTPWRGD signal. 

      Transition time (300 mV to 900 mV) 

Less than or equal to 100 µs 

The transition region covered by this requirement is 300 mV to 900 mV.  Once the VTTPWRGD signal 
is in that voltage range, the processor is more sensitive to noise, which may be present on the signal.  
The transition region when the signal first crosses the 300 mV voltage level and continues until the last 
time it is below 900 mV. 

The transition time is defined as the time the signal takes to move through the transition region. A     
100-µs transition time will ensure that the processor receives a good transition edge.