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参数资料
| 型号： | MPC8306VMABDCA |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 133 MHz, RISC PROCESSOR, PBGA369 |
| 封装： | 19 X 19 MM, 1.61 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, MAPBGA-369 |
| 文件页数： | 70/76页 |
| 文件大小： | 474K |
| 代理商： | MPC8306VMABDCA |
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MPC8306 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0
72
Freescale Semiconductor
System Design Information
to minimize inductance. Suggested bulk capacitors—100 to 330 F (AVX TPS tantalum or Sanyo
OSCON).
24.4
Output Buffer DC Impedance
For all buses, the driver is a push-pull single-ended driver type (open drain for I2C).
To measure Z0 for the single-ended drivers, an external resistor is connected from the chip pad to OVDD
or GND. Then, the value of each resistor is varied until the pad voltage is OVDD/2 (see Figure 44). The
output impedance is the average of two components, the resistances of the pull-up and 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.
Figure 44. Driver Impedance Measurement
The value of this resistance and the strength of the driver’s current source can be found by making two
measurements. First, the output voltage is measured while driving logic 1 without an external differential
termination resistor. The measured voltage is V1 = Rsource Isource. Second, the output voltage is measured
while driving logic 1 with an external precision differential termination resistor of value Rterm. The
measured voltage is V2 =(1/(1/R1 +1/R2)) Isource. Solving for the output impedance gives
Rsource =Rterm (V1/V2 – 1). The drive current is then Isource =V1/Rsource.
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC8306VMACDC | 制造商:Freescale Semiconductor 功能描述:MPC8306VMACDC - Bulk |
| MPC8306VMACDCA | 功能描述:微处理器 - MPU E300 MP 200 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 |
| MPC8306VMADDC | 制造商:Freescale Semiconductor 功能描述:MPC8306VMADDC - Bulk |
| MPC8306VMADDCA | 功能描述:微处理器 - MPU E300 MP 266 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 |
| MPC8306VMADDCA | 制造商:Freescale Semiconductor 功能描述:IC 32-BIT MPU 266 MHz 369-LFBGA |
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