- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98083 > SME5434PCI-440 64-BIT, 440 MHz, RISC PROCESSOR, XMA PDF資料下載
參數(shù)資料
| 型號： | SME5434PCI-440 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 64-BIT, 440 MHz, RISC PROCESSOR, XMA |
| 封裝： | 130 X 100 MM, 45 MM HEIGHT MODULE |
| 文件頁數(shù)： | 13/30頁 |
| 文件大小： | 393K |
| 代理商： | SME5434PCI-440 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
20
SME5431PCI-360
SME5434PCI-440
Preliminary
360/440MHz CPU; 0.25 to 2 MB L2 cache; UPA64S, 66MHz PCI Interfaces
UltraSPARC IIi CPU Module
September 2001
Sun Microsystems, Inc
Two Step Approach to the Thermal Design
Step One determines the air ow requirements based on the CPU power dissipation and the thermal charac-
teristics of the CPU package and the surrounding heatsink assembly. The specications for the heatsink are
provided in the table "Heatsink-to-Air Thermal Resistance" on page 21.
Step Two verifies cooling effectiveness by measuring the heatsink or case temperature and calculating the
junction temperature. The junction temperature must not exceed the CPU specification. In addition, the lower
the junction temperature, the higher the system reliability. The CPU temperature must be calculated for a
range of loads and environmental conditions, using one of the temperature measuring methods described in
the following sections.
Temperature Estimating and Measuring Methods
The following methods can be used to measure the case temperature of the module and to estimate the air-
ow required to cool it.
Case Temperature Method
The relationship between case temperature and junction temperature is described in the following thermal
equation.
If Tc is known, then Tj can be calculated:
Tj = Tc + (Pd x
θjc)
There is good tracking between the case temperature and the heatsink temperature.
Heatsink Temperature Method (Preferred Method)
Measuring the heatsink temperature is sometimes easier than measuring the case temperature. This method
provides accurate results for most designs. If the heatsink temperature (Ts) is known then the following ther-
mal equation can be used to estimate the junction temperature.
Tj = Ts + [Pd (
θjc + θcs)]
Airow Cooling Estimate Method
The relationship between air temperature and junction temperature is described in the thermal equation:
Tj =
Ti + [Pd (
θjc + θcs + θsa)]
Determination of the inlet air temperature (Ti) and the “free-stream” air velocity is required in order to apply
the airow method. The table:"Heatsink-to-Air Thermal Resistance" on page 21 uses the air velocity direction
relative to the heatsink orientation to nd the thermal resistance between the heatsink and air (
θsi).
Note that the airow velocity can be measured using a velocity meter. Alternatively, it may be determined by
knowing the performance of the fan that is supplying the airow. Calculating the airow velocity is difcult.
It is subject to the interpretation of the term “free-stream.”
相關PDF資料 |
PDF描述 |
|---|---|
| SME5434PCI-480 | 64-BIT, 480 MHz, RISC PROCESSOR, XMA |
| SMFR-29C516ESC | 16-BIT ERROR DETECT AND CORRECT CKT, QFP100 |
| SMJ320C26FJ | 16-BIT, 40 MHz, OTHER DSP, CQCC68 |
| SMJ320C31KGDM40B | 32-BIT, 40 MHz, OTHER DSP, UUC132 |
| SMJ320C40KGDS50C | 32-BIT, 50 MHz, OTHER DSP, UUC325 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| S-ME6 | 制造商:Phoenix Contact 功能描述:Lock, switching, ME terminal |
| SME6.3T471M8X16LL | 制造商:Texas Instruments 功能描述:EA471-6R3M85 |
| SME6.3VB101M6X11LL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MINIATURE, GENERAL PURPOSE, SOLVENT PROOF |
| SME6.3VB102M10X12LL | 制造商:United Chemi-Con Inc 功能描述:Capacitor, Aluminium, 1mf, 6.3V, 20±% |
| SME6.3VB103M16X31LL | 功能描述:鋁質(zhì)電解電容器 - 帶引線 10KuF 6.3V RoHS:否 制造商:Kemet 引線類型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類型:Radial 外殼直徑:8 mm 外殼長度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復。