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HH80547PG1042MH
Datasheet
33
Electrical Specifications
2.12
V
CC
Overshoot Specification
The Pentium 4 processor 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
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. Consult the Voltage Regulator-Down (VRD) 10.1 Design
Guide for Desktop LGA775 Socket for proper application of the overshoot specification.
VCC_SENSE and VSS_SENSE lands. Consult the Voltage Regulator-Down (VRD) 10.1 Design
Guide for Desktop LGA775 Socket for proper application of the overshoot specification.
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
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.
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
T
OS_MAX
Time duration of V
CC
overshoot above VID
—
—
25
μs
Figure 2-4. V
CC
Overshoot Example Waveform
Time
Example Overshoot Waveform
Vol
tage (
V
)
VID
VID + 0.050
T
OS
V
OS
T
OS
: Overshoot time above VID
V
OS
: Overshoot above VID