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MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8

System Design Information

Freescale Semiconductor

example, assuming a Ta of 30°C, a Tr of 5°C, a CBGA 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 + θsa) × 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

heat flux of adjacent components), heat sink efficiency, heat sink attach, heat sink placement, next-level

interconnect technology, system air temperature rise, altitude, etc.

Due to the complexity and the many variations of system-level boundary conditions for today's

microelectronic equipment, the combined effects of the heat transfer mechanisms (radiation, convection,

and conduction) may vary widely. For these reasons, we recommend using conjugate heat transfer models

for the board, as well as system-level designs.

For system thermal modeling, the MPC7447 and MPC7457 thermal model is shown in Figure 30. Four

volumes will be used to represent this device. Two of the volumes, solder ball, and air and substrate, are

modeled using the package outline size of the package. The other two, die, and bump and underfill, have

the same size as the die. The silicon die should be modeled 9.64 × 11.0 × 0.74 mm with the heat source

applied as a uniform source at the bottom of the volume. The bump and underfill layer is modeled as 9.64 ×

11.0 × 0.069 mm (or as a collapsed volume) with orthotropic material properties: 0.6 W/(m K) in the

xy-plane and 2 W/(m K) in the direction of the z-axis. The substrate volume is 25 × 25 × 1.2 mm

(MPC7447) or 29 × 29 × 1.2 mm (MPC7457), and this volume has 18 W/(m K) isotropic conductivity.

The solder ball and air layer is modeled with the same horizontal dimensions as the substrate and is 0.9 mm

thick. It can also be modeled as a collapsed volume using orthotropic material properties: 0.034 W/(m

K) in the xy-plane direction and 3.8 W/(m K) in the direction of the z-axis.

相关代理商/技术参数	参数描述
MC7457RX1000NB	制造商:Motorola Inc 功能描述:
MC7457RX1000NC	功能描述:微处理器 - MPU APOLO7 RV1.2 1.1V 105C RoHS:否制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC7457RX1200PB	制造商:Freescale Semiconductor 功能描述:A7, 1.35V +50MV/-30MV - Trays
MC7457RX1267LB	制造商:Freescale Semiconductor 功能描述:MPC74XX RISC 32-BIT 0.13UM 1.267GHZ 1.5V/1.8V/2.5V 483-PIN F - Trays
MC7457RX1267LC	功能描述:微处理器 - MPU APOLO7 RV1.2 1.3V 105C RoHS:否制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324

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