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参数资料
| 型号： | MPC7410RX500LX |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 500 MHz, RISC PROCESSOR, CBGA360 |
| 封装： | 25 X 25 MM, 3.20 MM HEIGHT, 1.27 MM PITCH, CERAMIC, BGA-360 |
| 文件页数： | 27/44页 |
| 文件大小： | 885K |
| 代理商： | MPC7410RX500LX |
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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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