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| 型号： | MPC745BPX350LE |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 350 MHz, RISC PROCESSOR, PBGA255 |
| 封装： | 21 X 21 MM, 2.80 MM HEIGHT, 1.27 MM PITCH, PLASTIC, BGA-255 |
| 文件页数： | 36/60页 |
| 文件大小： | 1559K |
| 代理商： | MPC745BPX350LE |
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MPC755 RISC Microprocessor Hardware Specifications, Rev. 7.0
Freescale Semiconductor
41
System Design Information
Figure 22 describes the driver impedance measurement circuit described above.
Figure 22. Driver Impedance Measurement Circuit
Alternately, the following is another method to determine the output impedance of the MPC755. A voltage
source, Vforce, is connected to the output of the MPC755 as shown in Figure 23. Data is held low, the
voltage source is set to a value that is equal to (L2)OVDD/2 and the current sourced by Vforce is measured.
The voltage drop across the pull-down device, which is equal to (L2)OVDD/2, is divided by the measured
current to determine the output impedance of the pull-down device, RN. Similarly, the impedance of the
pull-up device is determined by dividing the voltage drop of the pull-up, (L2)OVDD/2, by the current sank
by the pull-up when the data is high and Vforce is equal to (L2)OVDD/2. This method can be employed with
either empirical data from a test setup or with data from simulation models, such as IBIS.
RP and RN are designed to be close to each other in value. Then Z0 = (RP + RN)/2.
Figure 23 describes the alternate driver impedance measurement circuit.
Figure 23. Alternate Driver Impedance Measurement Circuit
(L2)OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
(L2)OVDD
BGA
Data
Pin
Vforce
OGND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC745BVT300LE | 功能描述:微处理器 - MPU GF REV2.8105C 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 |
| MPC745BVT350LE | 功能描述:微处理器 - MPU GF REV2.8105C 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 |
| MPC745CPX350LE | 功能描述:微处理器 - MPU GF REV 2.8 105C 6W 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 |
| MPC745CPX350LE | 制造商:Freescale Semiconductor 功能描述:IC 32-BIT MPU 350MHZ 255-FCPBGA |
| MPC745CVT350LE | 功能描述:微处理器 - MPU GF REV2.8@6W 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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