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| 型号： | MC7447AVS1267LB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 32/56页 |
| 文件大小： | 0K |
| 描述： | IC MPU RISC 1267MHZ 360-FCCLGA |
| 标准包装： | 44 |
| 系列： | MPC74xx |
| 处理器类型： | 32-位 MPC74xx PowerPC |
| 速度： | 1.267GHz |
| 电压： | 1.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 360-CLGA，FCCLGA |
| 供应商设备封装： | 360-FCCLGA（25x25） |
| 包装： | 托盘 |
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MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
38
Freescale Semiconductor
System Design Information
These capacitors should have a value of 0.01 or 0.1 F. Only ceramic surface mount technology (SMT)
capacitors should be used to minimize lead inductance. Orientations where connections are made along
the length of the part, such as 0204, are preferable but not mandatory. Consistent with the
recommendations of Dr. Howard Johnson in High Speed Digital Design: A Handbook of Black Magic
(Prentice Hall, 1993) and contrary to previous recommendations for decoupling Freescale
microprocessors, multiple small capacitors of equal value are recommended over using multiple values of
capacitance.
In addition, it is recommended that there be several bulk storage capacitors distributed around the PCB,
feeding the VDD and OVDD planes, to enable quick recharging of the smaller chip capacitors. These bulk
capacitors should have a low equivalent series resistance (ESR) rating to ensure the quick response time
necessary. They should also be connected to the power and ground planes through two vias to minimize
inductance. Suggested bulk capacitors are: 100–330 F (AVX TPS tantalum or Sanyo OSCON).
9.4
Connection Recommendations
To ensure reliable operation, it is highly recommended to connect unused inputs to an appropriate signal
level. Unless otherwise noted, unused active-low inputs should be tied to OVDD, and unused active-high
inputs should be connected to GND. All NC (no connect) signals must remain unconnected.
Power and ground connections must be made to all external VDD, OVDD, and GND pins in the
MPC7447A. For backward compatibility with the MPC7447, MPC7445, and MP7441, or for migrating a
system originally designed for one of these devices to the MPC7447A, the new power and ground signals
(formerly NC, see Table 12) may be left unconnected. There is no performance degradation associated
with leaving these pins unconnected. However, future devices may require these additional power and
ground signals to be connected to achieve maximum performance, and it is recommended that new designs
include the additional connections to facilitate future upgrades. See also Section 7, “Pinout Listings,” for
additional information.
9.5
Output Buffer DC Impedance
The MPC7447A processor bus drivers are characterized over process, voltage, and temperature. To
measure Z0, an external resistor is connected from the chip pad to OVDD or GND. The value of each
resistor is varied until the pad voltage is OVDD/2. Figure 18 shows the driver impedance measurement.
The output impedance is the average of two components—the resistances of the pull-up and pull-down
devices. When data is held low, SW2 is closed (SW1 is open), and RN is trimmed until the voltage at the
pad equals OVDD/2. RN then becomes the resistance of the pull-down devices. When data is held high,
SW1 is closed (SW2 is open), and RP is trimmed until the voltage at the pad equals OVDD/2. RP then
becomes the resistance of the pull-up devices. RP and RN are designed to be close to each other in value.
Then, Z0 = (RP + RN)/2.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC7447AVS1333LB | 功能描述:微处理器 - MPU A7PM LGA RV1.1 1.1V 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 |
| MC7447AVS1420LB | 功能描述:微处理器 - MPU A7PM PB FREE 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 |
| MC7447AVS600NB | 功能描述:微处理器 - MPU A7PM LGA RV1.1 1.1V 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 |
| MC7447AVS733NB | 功能描述:微处理器 - MPU A7PM LGA RV1.1 1.1V 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 |
| MC7447AVS867NB | 功能描述:微处理器 - MPU A7PM LGA RV1.1 1.1V 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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