Datasheet 33
Electrical Specifications
2.12 V
CC
Overshoot Specification
The Pentium 4 processor in the 775-land package can tolerate short transient overshoot events
where V
CC
exceeds the VID voltage when transitioning from a high to low current load condition.
This overshoot cannot exceed VID + V
OS_MAX
(V
OS_MAX
is the maximum allowable overshoot
voltage). The time duration of the overshoot event must not exceed T
OS_MAX
(T
OS_MAX
is the
maximum allowable time duration above VID). These specifications apply to the processor die
voltage as measured across the VCC_SENSE and VSS_SENSE lands.
NOTES:
1. V
OS
is measured overshoot voltage.
2. T
OS
is measured time duration above VID.
2.12.1 Die Voltage Validation
Overshoot events from application testing on real processors must meet the specifications in
Table 2-17 when measured across the VCC_SENSE and VSS_SENSE lands. Overshoot events that
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.
Table 2-17. V
CC
Overshoot Specifications
Symbol Parameter Min Typ Max Unit Figure
V
OS_MAX
Magnitude of V
CC
overshoot above VID
— — 0.050 V 2-4
T
OS_MAX
Time duration of V
CC
overshoot above VID
—— 25 µs 2-4
Figure 2-4. V
CC
Overshoot Example Waveform
Time
Example Overshoot Waveform
Voltage (V)
VID
VID + 0.050
T
OS
V
OS
T
OS
: Overshoot time above VID
V
OS
: Overshoot above VID
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