參數(shù)資料
型號(hào)： MC7447AHX1267LB
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 42/56頁(yè)
文件大?。?/td> 0K
描述： IC MPU RISC 32BIT 360-FCCBGA
標(biāo)準(zhǔn)包裝： 44
系列： MPC74xx
處理器類型： 32-位 MPC74xx PowerPC
速度： 1.267GHz
電壓： 1.3V
安裝類型： 表面貼裝
封裝/外殼： 360-BCBGA，F(xiàn)CCBGA
供應(yīng)商設(shè)備封裝： 360-FCCBGA（25x25）
包裝： 托盤(pán)
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
47
System Design Information
Shin-Etsu MicroSi, Inc.
888-642-7674
10028 S. 51st St.
Phoenix, AZ 85044
Internet: www.microsi.com
Thermagon Inc.
888-246-9050
4707 Detroit Ave.
Cleveland, OH 44102
Internet: www.thermagon.com
The following section provides a heat sink selection example using one of the commercially available heat
sinks.
9.8.3
Heat Sink Selection Example
For preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
Tj = Ti + Tr + (RθJC + Rθint + Rθsa) × Pd
where:
Tj is the die-junction temperature
Ti is the inlet cabinet ambient temperature
Tr is the air temperature rise within the computer cabinet
RθJC is the junction-to-case thermal resistance
Rθint is the adhesive or interface material thermal resistance
Rθsa 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 specified in
Table 4. The temperature of air cooling the component greatly depends on the ambient inlet air temperature
and the air temperature rise within the electronic cabinet. An electronic cabinet inlet-air temperature (Ti)
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 (Rθint) is typically about 1.5°C/W. For
example, assuming a Ti of 30°C, a Tr of 5°C, an HCTE package RθJC = 0.1, and a typical power
consumption (Pd) of 18.7 W, the following expression for Tj is obtained:
Die-junction temperature:
Tj = 30°C + 5°C + (0.1°C/W + 1.5°C/W + Rθsa) × 18.7 W
For this example, a Rθsavalue of 2.1°C/W or less is required to maintain the die junction temperature below
the maximum value of Table 4.
Though the die-junction-to-ambient and the heat-sink-to-ambient thermal resistances are a common
figure-of-merit used for comparing the thermal performance of various microelectronic packaging
technologies, one should exercise caution when only using this metric in determining thermal management
because no single parameter can adequately describe three-dimensional heat flow. The final die-junction
operating temperature is not only a function of the component-level thermal resistance, but the
system-level design and its operating conditions. In addition to the component's power consumption, a
number of factors affect the final operating die-junction temperature—airflow, board population (local
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MC7447AHX1333LB 制造商:Freescale Semiconductor 功能描述:MPU MPC74XX RISC 32BIT 0.13UM 1.333GHZ 1.8V/2.5V 360FCCBGA - Trays
MC7447AHX1420LB 功能描述:微處理器 - MPU APOLO7PM RV1.1 1.3V 105C RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MC7447AHX1420PC 制造商:Freescale Semiconductor 功能描述:MPU MPC74XX RISC 32BIT 0.13UM 1.42GHZ 1.8V/2.5V 360FCCBGA - Bulk
MC7447AHX1600PC 制造商:Freescale Semiconductor 功能描述:MPU MPC74XX RISC 32BIT 0.13UM 1.6GHZ 1.8V/2.5V 360FCCBGA - Bulk
MC7447AHX1700PC 制造商:Freescale Semiconductor 功能描述:APL7PM,RV1.1.1,1.38V,75C - Trays
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