參數(shù)資料
型號: MCF54454VR266
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 266 MHz, RISC PROCESSOR, PBGA360
封裝: 23 X 23 MM, ROHS COMPLIANT, TEPBGA-360
文件頁數(shù): 45/48頁
文件大?。?/td> 945K
代理商: MCF54454VR266
MCF5445x ColdFire Microprocessor Data Sheet, Rev. 6
Hardware Design Considerations
Freescale Semiconductor
6
3.2
Oscillator Power Filtering
Figure 3 shows an example for isolating the oscillator power supply from the I/O supply (EVDD) and ground.
Figure 3. Oscillator Power Filter
3.3
Supply Voltage Sequencing
Figure 4 shows situations in sequencing the I/O VDD (EVDD), SDRAM VDD (SDVDD), PLL VDD (PVDD), and internal
logic/core VDD (IVDD).
Figure 4. Supply Voltage Sequencing and Separation Cautions
The relationship between SDVDD and EVDD is non-critical during power-up and power-down sequences. SDVDD (2.5V or
1.8V) and EVDD are specified relative to IVDD.
VDD_OSC
10
Ω
0.1 F
EVDD Pin
1 F
GND
VSS_OSC
100 MHz
EVDD (3.3V)
IVDD, PVDD
Time
3.3V
1.5V
0
D
C
Po
wer
Su
ppl
y
V
olt
age
Notes:
1 Input voltage must not be greater than the supply voltage (EV
DD, SDVDD, IVDD, or PVDD) by more than 0.5V
at any time, including during power-up.
2 Use 50 V/millisecond or slower rise time for all supplies.
2.5V
Supplies Stable
SDVDD (2.5V — DDR)
1.8V
SDVDD (1.8V — DDR2)
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