Intel 1.70 GHz RH80532NC029256 Data Sheet

298517-006 Datasheet 

63 

Transition time (300 mV to 900 mV) 

Less than or equal to 100 µs 

 

In addition, the VTT_PWRGD 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 VTT_PWRGD signal.

 

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. 

The signal quality of the VTTPWRGD signal is critical to the correct operation of the processor. Every 
effort should be made to ensure this signal is monotonic in the transition region. If noise or glitches are 
present on this signal, the noise or glitches must be kept to less than 100 mV of a voltage drop from the 
highest voltage level received to that point. This glitch must remain less than 100 mV until the excursion 
ends by the voltage returning to the highest voltage previously received. Please see Figure 24 for an 
example graph of this situation and requirements.