![](http://datasheet.mmic.net.cn/260000/pentium-III_datasheet_15937006/pentium-III_45.png)
Datasheet
45
Pentium
III Processor for the PGA370 Socket at 500 MHz to 933 MHz
4.0
Thermal Specifications and Design Considerations
This chapter provides needed data for designing a thermal solution. However, for the correct
thermal measuring processes, refer to AP-905,
Intel
Pentium
III
Processor Thermal Design
Guidelines
(Order Number 245087). The Pentium
III
processor uses flip chip pin grid array
packaging technology and has a
junction
temperature (T
junction
) specified.
4.1
Thermal Specifications
Table 24
provides the thermal design power dissipation and maximum temperatures for the
Pentium
III
processor for the PGA370 socket. Systems should design for the highest possible
processor power, even if a processor with a lower thermal dissipation is planned. A thermal
solution should be designed to ensure the junction temperature never exceeds these specifications.
NOTES:
1. Thermal Design Power (TDP) represents the maximum amount of power the thermal solution is required to
dissipate. The thermal solution should be designed to dissipate the TDP power without exceeding the
maximum Tjunction specification.
2. TDP does not represent the power delivery and voltage regulation requirements for the processor. Refer to
Table 6 for voltage regulation and electrical specifications.
3. T
is the worst-case difference between the thermal reading from the on-die thermal diode and the
hottest location on the processor’s core.
4. T
values do not include any thermal diode kit measurement error. Diode kit measurement error
must be added to the T
value from the table, as outlined in the Pentium
III Processor Thermal
Design Guidelines. Intel has characterized the use of the Analog Devices AD1021 diode measurement kit
and found its measurement error to be 1 °C.
Table 24. Intel
Pentium
III Processor for the PGA370 Socket Thermal Specifications
Processor
Processor
Core
Frequency
(MHz)
L2 Cache
Size
(Kbytes)
Processor
Thermal
Design
Power
1,2
(W)
Power
Density
5
(W/cm
2
)
Maximum
T
JUNCTION
T
JUNC3,4,6
Offset
(°C)
500E
500
256
13.2
18.2
85
1.9
533EB
533
256
14.0
19.3
85
2.0
550E
550
256
14.5
20.0
85
2.1
600E
600
256
15.8
21.8
82
2.3
600EB
600
256
15.8
21.8
82
2.3
650
650
256
17.0
23.4
82
2.5
667
667
256
17.5
24.1
82
2.5
700
700
256
18.3
25.2
80
2.7
733
733
256
19.1
26.3
80
2.8
750
750
256
19.5
26.9
80
2.8
800
800
256
20.8
28.7
80
3.0
800EB
800
256
20.8
28.7
80
3.0
850
850
256
22.5
31.0
80
3.3
866
866
256
22.9
31.5
80
3.3
933
933
256
24.5
33.8
75
3.6