參數(shù)資料
型號： MPC755BRX300LE
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： RISC Microprocessor Hardware Specifications
中文描述： 32-BIT, 300 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, CERAMIC, BGA-360
文件頁數(shù)： 45/56頁
文件大?。?/td> 1652K
代理商： MPC755BRX300LE
MPC755 RISC Microprocessor Hardware Specifications, Rev. 6.1
Freescale Semiconductor
45
System Design Information
Alpha Novatech
473 Sapena Ct. #15
Santa Clara, CA 95054
Internet: www.alphanovatech.com
International Electronic Research Corporation (IERC)
413 North Moss St.
Burbank, CA 91502
Internet: www.ctscorp.com
Tyco Electronics
Chip Coolers
P.O. Box 3668
Harrisburg, PA 17105-3668
Internet: www.chipcoolers.com
Wakefield Engineering
33 Bridge St.
Pelham, NH 03076
Internet: www.wakefield.com
408-749-7601
818-842-7277
800-522-6752
603-635-5102
Ultimately, the final selection of an appropriate heat sink depends on many factors, such as thermal performance at
a given air velocity, spatial volume, mass, attachment method, assembly, and cost.
8.8.1
Internal Package Conduction Resistance
For the exposed-die packaging technology, shown in
Table 4
, the intrinsic conduction thermal resistance paths are
as follows:
The die junction-to-case (or top-of-die for exposed silicon) thermal resistance
The die junction-to-ball thermal resistance
Figure 26
depicts the primary heat transfer path for a package with an attached heat sink mounted to a printed-circuit
board.
Heat generated on the active side of the chip is conducted through the silicon, then through the heat sink attach
material (or thermal interface material), and finally to the heat sink where it is removed by forced-air convection.
Since the silicon thermal resistance is quite small, for a first-order analysis, the temperature drop in the silicon may
be neglected. Thus, the heat sink attach material and the heat sink conduction/convective thermal resistances are the
dominant terms.
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