參數資料
型號: MCF53017CMJ240
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: MICROPROCESSOR, PBGA256
封裝: 17 X 17 MM, ROHS COMPLIANT, PLASTIC, MAPBGA-256
文件頁數: 56/62頁
文件大?。?/td> 2365K
代理商: MCF53017CMJ240
MCF5301x Data Sheet, Rev. 5
Preliminary—Subject to Change Without Notice
Hardware Design Considerations
Freescale Semiconductor
6
Figure 1. System PLL VDD Power Filter
3.2
USB Power Filtering
To minimize noise, external filters are required for each of the USB power pins. The filter shown in Figure 2 should be
connected between the board EVDD and each of the USBVDD pins. The resistor and capacitors should be placed as close to the
dedicated USBVDD pin as possible.
Figure 2. USB VDD Power Filter
NOTE
In addition to the above filter circuitry, a 0.01 F capacitor is also recommended in parallel
with those shown.
3.3
Supply Voltage Sequencing
Figure 3 shows situations in sequencing the I/O VDD (EVDD), SDRAM VDD (SDVDD), PLL VDD (PVDD), and internal logic /
core VDD (IVDD). The relationship between SDVDD and EVDD is non-critical during power-up and power-down sequences.
Both SDVDD (2.5V or 1.8V) and EVDD are specified relative to IVDD.
Board IVDD
10
Ω
0.1 F
PLL VDD Pin
10 F
GND
Board EVDD
0
Ω
0.1 F
USB VDD Pin
10 F
GND
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