參數(shù)資料
型號(hào): MCF5471VR200
廠商: FREESCALE SEMICONDUCTOR INC
元件分類(lèi): 微控制器/微處理器
英文描述: 32-BIT, 200 MHz, RISC PROCESSOR, PBGA388
封裝: 27 X 27 MM, MS-034AAL-1, PBGA-388
文件頁(yè)數(shù): 31/34頁(yè)
文件大小: 600K
代理商: MCF5471VR200
MCF547x ColdFire Microprocessor, Rev. 4
Hardware Design Considerations
Freescale Semiconductor
6
4
Hardware Design Considerations
4.1
PLL Power Filtering
To further enhance noise isolation, an external filter is strongly recommended for PLL analog VDD pins. The filter shown in
Figure 2 should be connected between the board VDD and the PLL VDD pins. The resistor and capacitors should be placed as
close to the dedicated PLL VDD pin as possible.
Figure 2. System PLL VDD Power Filter
4.2
Supply Voltage Sequencing and Separation Cautions
Figure 3 shows situations in sequencing the I/O VDD (EVDD), SDRAM VDD (SD VDD), PLL VDD (PLL VDD), and Core VDD
(IVDD).
Output high voltage IOH = 8 mA, 16 mA,24 mA
VOH
2.4
V
Output low voltage IOL = 8 mA, 16 mA,24 mA
5
VOL
—0.5
V
Capacitance 3, Vin =0 V, f = 1 MHz
CIN
—TBD
pF
Input leakage current
Iin
–1.0
1.0
μA
1 IV
DD and PLL VDD should be at the same voltage. PLL VDD should have a filtered input. Please see Figure 2 for an
example circuit. There are three PLL VDD inputs. A filter circuit should used on each PLL VDD input.
2 This specification is guaranteed by design and is not 100% tested.
3 Capacitance C
IN is periodically sampled rather than 100% tested.
Table 4. DC Electrical Specifications (continued)
Characteristic
Symbol
Min
Max
Units
Board VDD
10
Ω
0.1 F
PLL VDD Pin
10 F
GND
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