845GL datasheet(147/193 Pages) INTEL

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Intel® 82845G/82845GL/82845GV GMCH Datasheet

147

Electrical Characteristics

This chapter contains the thermal characteristics, power characteristics and DC characteristics for

the GMCH component.

Note: SDR signals are multiplexed with DDR signals. The specific signal’s timing and voltage level is

dependent on the 845G GMCH memory mode selected. This document differentiates the two by

following each signal with either SDR or DDR, as appropriate.

6.1

Absolute Maximum Ratings

Table 6-1 lists the GMCH’s maximum environmental stress ratings. Functional operation at the

absolute maximum and minimum is neither implied nor guaranteed. Functional operating

parameters are listed in the DC characteristics tables.

Warning: Stressing the device beyond the “Absolute Maximum Ratings” may cause permanent damage.

These are stress ratings only. Operating beyond the “operating conditions” is not recommended and

extended exposure beyond “operating conditions” may affect reliability.

6.2

Thermal Characteristics

The GMCH is designed for operation at die temperatures between 0

°C and 97 °C. The thermal

resistance of the package is given in Table 6-2. See the Intel® 845G/845GL /845GV Chipset:

Intel® 82845G/82845GL Graphics and Memory Controller Hub (GMCH) Thermal and

Mechanical Design Guidelines for more information.

NOTE:

Refer to the Intel® 845G/845GL/845GV Chipset: Intel® 82845G/82845GL/82845GV Graphics and

Memory Controller Hub (GMCH) Thermal and Mechanical Design Guidelines

for more information.

Table 6-1. Absolute Maximum Ratings

Symbol

Parameter

Min

Max

Unit

Tdie

Die Temperature under Bias

°C

Tstorage

Storage Temperature

-55

150

°C

VCC1_5

1.5 V Supply Voltage with respect to VSS

-0.3

1.75

VTT

AGTL+ buffer DC input voltage with respect to VSS

-0.3

1.75

VCCSM(DDR)

2.5 V DDR Supply Voltage with respect to VSS

-0.5

VCCSM(SDR)

3.3 V Supply Voltage with respect to VSS

-0.3

3.6

Table 6-2. Intel® 82845G GMCH Package Thermal Resistance

Parameter

Airflow Velocity in Meters/Second

No Air Flow

1 m/s

Ψjt (°C/Watt)**

(see note)

Θja (°C/Watt)**

(see note)

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