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| 型號(hào)： | MPC8568CVTANGGA |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 800 MHz, RISC PROCESSOR, PBGA1023 |
| 封裝： | 33 X 33 MM, 2.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, FCPBGA-1023 |
| 文件頁(yè)數(shù)： | 37/140頁(yè) |
| 文件大?。?/td> | 1456K |
| 代理商： | MPC8568CVTANGGA |
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MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 0
Freescale Semiconductor
131
System Design Information
Each circuit should be placed as close as possible to the specific AVDD type pin being supplied to minimize
noise coupled from nearby circuits. It should be possible to route directly from the capacitors to the AVDD
type pin, which is on the periphery of 1023FC-PBGA the footprint, without the inductance of vias.
Figure 73 shows the PLL power supply filter circuits for all PLLs except SerDes PLL.
Figure 73. MPC8568E PLL Power Supply Filter Circuit
The AVDD_SRDS signal provides power for the analog portions of the SerDes PLL. To ensure stability of
the internal clock, the power supplied to the PLL is filtered using a circuit similar to the one shown in
following figure. For maximum effectiveness, the filter circuit is placed as closely as possible to the
AVDD_SRDS and AGND_SRDS ball to ensure it filters out as much noise as possible. The 0.003-F
capacitor is closest to the ball, followed by the 2.2-F capacitors, and finally the 1 ohm resistor to the board
supply plane. Use ceramic chip capacitors with the highest possible self-resonant frequency. All traces
should be kept short, wide and direct.
Figure 74. SerDes PLL Power Supply Filter
Note the following:
AVDD_SRDS should be a filtered version of SCOREVDD.
The transmitter output signals on the SerDes interface are fed from the XVDD power plan.
Power: XVDD consumes less than 300mW. SCOREVDD + AVDD_SRDS consumes less than
750mW.
25.3
Decoupling Recommendations
Due to large address and data buses, and high operating frequencies, the device can generate transient
power surges and high frequency noise in its power supply, especially while driving large capacitive loads.
MPC8568E system, and the device itself requires a clean, tightly regulated source of power. Therefore, it
is recommended that the system designer place at least one decoupling capacitor at each VDD, TVDD,
BVDD, OVDD, GVDD, and LVDD pin of the device. These decoupling capacitors should receive their
power from separate VDD,TVDD, BVDD, OVDD, GVDD, and LVDD and GND power planes in the PCB,
utilizing short traces to minimize inductance. Capacitors may be placed directly under the device using a
standard escape pattern. Others may surround the part.
VDD
AVDD
2.2
μF
2.2
μF
GND
Low ESL Surface Mount Capacitors
10
Ω
2.2
μF1 0.003 μF
AGND_SRDS
1.0
Ω
AVDD_SRDS
1. An 0805 sized capacitor is recommended for system initial bring-up.
SCOEVDD
2.2
μF1
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