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2.12
V
Overshoot Specification
CC
The Pentium 4 processor in the 775-land package can tolerate short transient overshoot events
where V
CC
This overshoot cannot exceed VID + V
voltage). 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 2-17. V
Overshoot Specifications
CC
Symbol
V
_
OS
MAX
T
_
OS
MAX
Figure 2-4. V
Overshoot Example Waveform
CC
NOTES:
1. V
is measured overshoot voltage.
OS
2. T
is measured time duration above VID.
OS
2.12.1
Die Voltage Validation
Overshoot events from application testing on real processors must meet the specifications in
Table 2-17
are < 10 ns in duration may be ignored. These measurements of processor die level overshoot
should be taken with a 100 MHz bandwidth limited oscilloscope. Refer to the Voltage Regulator
Down (VRD) 10.1 Design Guide For Desktop LGA775 Socket for additional voltage regulator
validation details.
Datasheet
exceeds the VID voltage when transitioning from a high to low current load condition.
Parameter
Min
Magnitude of V
CC
—
overshoot above VID
Time duration of V
CC
—
overshoot above VID
VID + 0.050
VID
T
: Overshoot time above VID
OS
V
: Overshoot above VID
OS
when measured across the VCC_SENSE and VSS_SENSE lands. Overshoot events that
(V
is the maximum allowable overshoot
_
_
OS
MAX
OS
MAX
Typ
Max
—
0.050
—
25
Example Overshoot Waveform
T
OS
Time
Electrical Specifications
(T
is the
_
_
OS
MAX
OS
MAX
Unit
Figure
V
2-4
µs
2-4
V
OS
33
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