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| 型号： | MPC180LMB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROPROCESSOR, PQFP100 |
| 封装： | LQFP-100 |
| 文件页数： | 17/28页 |
| 文件大小： | 356K |
| 代理商： | MPC180LMB |
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24
MPC180 Hardware Reference Manual
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Decoupling Recommendations
Once the PCB has been routed, the maximum lengths can be compared to the table to determine how much
margin was realized. Remember that many factors will affect the conversion from time delay to length
restrictions, especially loading and routing topology. Routing topology can also have a serious impact. Once
again, due to the various factors affecting the actual propagation delays on a PCB it is highly recommended
that a SPICE simulator is used to convert the time delays to length restrictions. This example assumes
signals are routed in a manner that effectively achieves incident wave switching.
8 Decoupling Recommendations
It is recommended that decoupling capacitors should have a value of 0.01 F or 0.1 F. Only ceramic SMT
(surface mount technology) capacitors should be used to minimize lead inductance, preferably 0508 or 0603
orientations where connections are made along the length of the part. Consistent with the recommendations
of Dr. Howard Johnson in High Speed Digital Design: A Handbook of Black Magic (Prentice Hall, 1993),
multiple small capacitors of equal value are recommended over using multiple values of capacitance.
In addition, it is recommended that there be several bulk storage capacitors distributed around the PCB,
feeding the VDD and OVDD planes, to enable quick recharging of the smaller chip capacitors. These bulk
capacitors should have a low ESR (equivalent series resistance) rating to ensure the quick response time
necessary. They should also be connected to the power and ground planes through two vias to minimize
inductance. Suggested bulk capacitors: 100-330 F (AVX TPS tantalum or Sanyo OSCON).
Table 21. Minimum PCB Length Restriction
Signal
Input Hold Margin
to MPC850
Input Hold Margin
to MPC860
Input Hold Margin
to MPC8260
D[0:31]
0.0 in
TA / LUPMWAIT
0.0 in
DREQx
—
0.0 in
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