Datasheet

Ordering Information
MCF5227x ColdFire
®
Microprocessor Data Sheet, Rev. 8
Freescale Semiconductor 5
2 Ordering Information
3 Hardware Design Considerations
3.1 PLL Power Filtering
To further enhance noise isolation, an external filter is strongly recommended for PLL analog V
DD
pins. The filter shown in
Figure 2 should be connected between the board V
DD
and the PLLV
DD
pins. The resistor and capacitors should be placed as
close to the dedicated PLLV
DD
pin as possible.
Figure 2. System PLL V
DD
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 3 should be
connected between the board EV
DD
and the USBV
DD
pin. The resistor and capacitors should be placed as close to the dedicated
USBV
DD
pin as possible.
Figure 3. USB V
DD
Power Filter
NOTE
In addition to the above filter circuitry, a 0.01 F capacitor is also recommended in parallel
with those shown.
Table 2. Orderable Part Numbers
Freescale Part
Number
Description Package Speed Temperature
MCF52274CLU120 MCF52274 RISC Microprocessor 176 LQFP 120 MHz –40
° to +85° C
MCF52277CVM160 MCF52277 RISC Microprocessor 196 MAPBGA 166.67 MHz –40
° to +85° C
Board IV
DD
10 Ω
0.1 µF
PLL V
DD
Pin
10 µF
GND
Board EV
DD
0 Ω
0.1 µF
USB V
DD
Pin
10 µF
GND