Intel Q9400S Data Sheet - Page 25
Example Overshoot Waveform
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Electrical Specifications 2.6.3 VCC Overshoot The processor 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 + VOS_MAX (VOS_MAX is the maximum allowable overshoot voltage). The time duration of the overshoot event must not exceed TOS_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. Table 2-5. VCC Overshoot Specifications Symbol Parameter Min Max Unit Figure Notes VOS_MAX Magnitude of VCC overshoot above VID - 50 mV 2-2 1 TOS_MAX Time duration of VCC overshoot above VID - 25 µs 2-2 1 NOTES: 1. Adherence to these specifications is required to ensure reliable processor operation. Figure 2-2. VCC Overshoot Example Waveform VID + 0.050 Example Overshoot Waveform VOS Voltage [V] VID - 0.000 2.6.4 TOS 0 5 10 15 20 25 Time [us] TOS: Overshoot time above VID VOS: Overshoot above VID NOTES: 1. VOS is measured overshoot voltage. 2. TOS is measured time duration above VID. Die Voltage Validation Overshoot events on processor must meet the specifications in Table 2-5 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 must be taken with a bandwidth limited oscilloscope set to a greater than or equal to 100 MHz bandwidth limit. Datasheet 25