Vcc Overshoot; Vcc Overshoot Example Waveform - Intel Quad-Core Xeon 3300 Series Datasheet

Electrical Specifications
3. The loadlines specify voltage limits at the die measured at the VCC_SENSE and
VSS_SENSE lands. Voltage regulation feedback for voltage regulator circuits must be taken
from processor VCC and VSS lands. Refer to the Voltage Regulator-Down (VRD) 11.0
Processor Power Delivery Design Guidelines For Desktop LGA775 Socket for socket loadline
guidelines and VR implementation details.
2.7.3 V Overshoot
CC
The processor can tolerate short transient overshoot events where V
voltage when transitioning from a high to low current load condition. This overshoot
cannot exceed VID + V
The time duration of the overshoot event must not exceed T
maximum allowable time duration above VID). These specifications apply to the
processor die voltage as measured across the VCC_SENSE and VSS_SENSE lands.
Table 2-5. V Overshoot Specifications
CC
Symbol
V
OS_MAX
T
OS_MAX
NOTES:
1. Adherence to these specifications is required to ensure reliable processor operation.
Figure 2-2. V Overshoot Example Waveform
CC
VID + 0.050
VID - 0.000
NOTES:
1. V
OS
2. T
OS
Datasheet
(V
OS_MAX OS_MAX
Parameter
Magnitude of V overshoot above
CC
VID
Time duration of V overshoot above
CC
VID
Example Overshoot Waveform
0 5
T
V
is measured overshoot voltage.
is measured time duration above VID.
is the maximum allowable overshoot voltage).
Min Max
- 50
- 25
T
OS
10 15
Time [us]
: Overshoot time above VID
OS
: Overshoot above VID
OS
exceeds the VID
CC
(T is the
OS_MAX OS_MAX
Unit Figure Notes
1
mV 2-2
1
µs 2-2
V
OS
20 25
21