參數(shù)資料
型號(hào)： MPC8245LZU350X
廠商： MOTOROLA INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 32-BIT, 350 MHz, RISC PROCESSOR, PBGA352
封裝： 35 X 35 MM, 1.65 MM HEIGHT, 1.27 MM PITCH, CAVITY DOWN, TBGA-352
文件頁(yè)數(shù)： 48/60頁(yè)
文件大?。?/td> 620K
代理商： MPC8245LZU350X
52
MPC8245 Integrated Processor Hardware Specications
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
System Design Information
Dow-Corning Corporation
800-248-2481
Dow-Corning Electronic Materials
PO Box 0997
Midland, MI 48686-0997
Internet: www.dow.com
Chomerics, Inc.
781-935-4850
77 Dragon Court
Woburn, MA 01888-4014
Internet: www.chomerics.com
Thermagon Inc.
888-246-9050
3256 West 25th Street
Cleveland, OH 44109-1668
Internet: www.thermagon.com
Loctite Corporation
860-571-5100
1001 Trout Brook Crossing
Rocky Hill, CT 06067-3910
Internet: www.loctite.com
The following section provides a heat sink selection example using one of the commercially available heat
sinks.
1.7.10.3 Heat Sink Selection Example
For preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
TJ = TA + TR + (θJC + θINT + θSA) * PD
Where:
TJ is the die-junction temperature
TA is the inlet cabinet ambient temperature
TR is the air temperature rise within the computer cabinet
θJC is the junction-to-case thermal resistance
θINT is the adhesive or interface material thermal resistance
θSA is the heat sink base-to-ambient thermal resistance
PD is the power dissipated by the device
During operation the die-junction temperatures (TJ) should be maintained less than the value specied in
Table 2. The temperature of the air cooling the component greatly depends upon the ambient inlet air
temperature and the air temperature rise within the electronic cabinet. An electronic cabinet inlet-air
temperature (TA) may range from 30 to 40 °C. The air temperature rise within a cabinet (TR) may be in the
range of 5 to 10 °C. The thermal resistance of the thermal interface material (
θINT) is typically about 1
°C/W. Assuming a TA of 30 °C, a TR of 5 °C, a TBGA package θJC = 1.8, and a maximum power
consumption (PD) of 2.5 Watts, the following expression for TJ is obtained:
Die-junction temperature: TJ = 30 °C + 5 °C + (1.8 °C/W + 1.0 °C/W + θSA) * 2.5 W
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