82G33 datasheet(381/437 Pages) INTEL

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Electrical Characteristics

Datasheet

381

11.4

DC Characteristics

11.4.1

I/O Buffer Supply Voltages

The I/O buffer supply voltage is measured at the MCH package pins. The tolerances

shown in the following table are inclusive of all noise from DC up to 20 MHz. In the

lab, the voltage rails should be measured with a bandwidth limited oscilloscope with a

roll off of 3 dB/decade above 20 MHz under all operating conditions.

The following table indicates which supplies are connected directly to a voltage

regulator or to a filtered voltage rail. For voltages that are connected to a filter, they

should me measured at the input of the filter.

If the recommended platform decoupling guidelines cannot be met, the system

designer will have to make tradeoffs between the voltage regulator output DC

tolerance and the decoupling performance of the capacitor network to stay within the

voltage tolerances listed below.

Table 11-5. I/O Buffer Supply Voltage

Symbol

Parameter

Min

Nom

Max

Unit

Notes

DDR2 I/O Supply Voltage

1.7

1.8

1.9

VCC_DDR

DDR3 I/O Supply Voltage

1.425

1.5

1.575

DDR2 Clock Supply Voltage

1.7

1.8

1.9

VCC_CKDDR

DDR3 Clock Supply Voltage

1.425

1.5

1.575

VCC_EXP

SDVO, PCI Express* Supply Voltage

1.188

1.25

1.313

VCCA_EXP

SDVO, PCI Express* Analog Supply Voltage

3.135

3.3

3.465

1.2 V System Bus Input

Supply Voltage

1.14

1.2

1.26

VTT_FSB

1.1 V System Bus Input

Supply Voltage

1.045

1.1

1.155

VCC

MCH Core Supply Voltage

1.188

1.25

1.313

VCC_CL

Controller Supply Voltage

1.188

1.25

1.313

VCC3_3

CMOS Supply Voltage

3.135

3.3

3.465

VCCA_DAC

Display DAC Analog Supply Voltage

3.135

3.3

3.465

VCCD_CRT

Display Digital Supply Voltage

1.425

1.5

1.575

VCCDQ_CRT

Display Quiet Digital Supply Voltage

1.425

1.5

1.575

VCCA_HPLL,

VCCAPLL_EXP,

VCCA_DPLLA

VCCA_DPLLB,

VCCA_MPLL

Various PLLs’ Analog Supply Voltages

1.188

1.25

1.313

NOTES:

The VCCD_CRT and VCCDQ_CRT can also operate at a nominal 1.8 V +/- 5% input voltage. Only

the 1.5 V nominal voltage setting will be validated internally.

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