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參數(shù)資料
| 型號： | MPC7410RX450LX |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 450 MHz, RISC PROCESSOR, CBGA360 |
| 封裝： | 25 X 25 MM, 3.20 MM HEIGHT, 1.27 MM PITCH, CERAMIC, BGA-360 |
| 文件頁數(shù)： | 27/44頁 |
| 文件大?。?/td> | 885K |
| 代理商： | MPC7410RX450LX |
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MPC7410 RISC Microprocessor Hardware Specifications
33
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
System Design Information
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.
Figure 20. Driver Impedance Measurement Circuit
Alternately, the following is another method to determine the output impedance of the MPC7410. A voltage
source, Vforce, is connected to the output of the MPC7410 as in Figure 21. 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 set up 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.
OVdd
OGND
RP
RN
Pad
Data
SW1
SW2
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| MPC7410RX450NE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MPC7410 RISC Microprocessor Hardware Specifications Addendum |
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| MPC7410THX450NE | 功能描述:微處理器 - MPU NT NITCE RV1.4,1.8V -40C 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 最大時鐘頻率:536 MHz 程序存儲器大小: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 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324 |
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