mcf54455 Freescale Semiconductor, Inc, mcf54455 Datasheet - Page 6

• Manufacturer Part Number: mcf54455
• Description: 32-bit Microprocessor With Usb On-the-go, Ethernet, Pci, Ddr2/ddr Controller And Encryption
• Manufacturer: Freescale Semiconductor, Inc

Hardware Design Considerations
3.2
Figure 3
3.3
Figure 4
logic/core V
The relationship between SDV
1.8V) and EV
6
shows an example for isolating the oscillator power supply from the I/O supply (EVDD) and ground.
shows situations in sequencing the I/O V
Notes:
1
2
Oscillator Power Filtering
Supply Voltage Sequencing
Input voltage must not be greater than the supply voltage (EV
at any time, including during power-up.
Use 50 V/millisecond or slower rise time for all supplies.
DD
DD
(IV
3.3V
2.5V
1.5V
1.8V
are specified relative to IV
DD
0
).
Figure 4. Supply Voltage Sequencing and Separation Cautions
DD
MCF5445x ColdFire
and EV
VDD_OSC
VSS_OSC
DD
DD
Figure 3. Oscillator Power Filter
is non-critical during power-up and power-down sequences. SDV
.
DD
(EV
Supplies Stable
®
1 µF
Microprocessor Data Sheet, Rev. 0
DD
), SDRAM V
100 MHz
0.1 µF
10 Ω
DD
DD
, SDV
(SDV
GND
DD
EVDD Pin
, IV
DD
), PLL V
DD
, or PV
EV
IV
SDV
SDV
DD
DD
DD
DD
, PV
DD
DD
) by more than 0.5V
(PV
(3.3V)
Freescale Semiconductor
(2.5V — DDR)
(1.8V — DDR2)
DD
DD
), and internal
Time
DD
(2.5V or