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Datasheet

Electrical Specifications

2.12

VCC Overshoot Specification

The Pentium 4 processor in the 775-land package can tolerate short transient overshoot events

where VCC exceeds the VID voltage when transitioning from a high to low current load condition.

This overshoot cannot exceed VID + V

_MAX (VOS_MAX is the maximum allowable overshoot

voltage). The time duration of the overshoot event must not exceed T

_MAX (TOS_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. VOS is measured overshoot voltage.

2. TOS 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. VCC Overshoot Specifications

Symbol

Parameter

Min

Typ

Max

Unit

Figure

_MAX

Magnitude of VCC

overshoot above VID

—

0.050

2-4

_MAX

Time duration of VCC

overshoot above VID

——

µs

2-4

Figure 2-4. VCC Overshoot Example Waveform

Time

Example Overshoot Waveform

VID

VID + 0.050

OS: Overshoot time above VID

OS: Overshoot above VID

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