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| 型号： | IBM25PPC750FX-GB0132T |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 600 MHz, RISC PROCESSOR, CBGA292 |
| 封装： | 21 X 21 MM, 1 MM PITCH, CERAMIC, BGA-292 |
| 文件页数： | 39/62页 |
| 文件大小： | 452K |
| 代理商： | IBM25PPC750FX-GB0132T |
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DD 2.X
PowerPC 750FX RISC Microprocessor
Preliminary
5. System Design Information
Page 42 of 63
Body_750FX_DS_DD2.X.fm.2.0
June 9, 2003
5.4 Output Buffer DC Impedance
The 750FX 60x drivers were characterized over various process, voltage, and temperature conditions. To
measure Z0, an external resistor is connected to the chip pad, either to OVDD or GND. Then the value of such
The output impedance is actually the average of two resistances: the resistance of the pull-up and the resis-
tance of pull-down devices. When Data is held low, SW1 is closed (SW2 is open), and RN is trimmed until
Pad=OVDD/2. RN then becomes the resistance of the pull-down devices. When Data is held high, SW2 is
closed (SW1 is open), and RP is trimmed until Pad = OVDD/2. RP then becomes the resistance of the pull-up
devices. With a properly designed driver RP and RN are close to each other in value, then Z0 = (RP + RN)/2.
Figure 5-6. Driver Impedance Measurement
Data
OV
DD
R
P
SW2
SW1
Pad
R
N
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IBM25PPC750FX-GB0132V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB0133V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB0532V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB0533V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB1032V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
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