Revision 1.08 – October 15, 2007
440GRx – PPC440GRx Embedded Processor
Preliminary Data Sheet
Power Sequencing
Startup sequencing of the power supply voltages is not required. However, a power-down cycle must complete
(OV and V are below +0.4V) before a new power-up cycle is started.
DD
DD
Analog Voltage Filter
The analog voltages (AVdd and EAVdd) used for the on-chip PLLs can be derived from the logic voltage, but must be filtered
before entering the PPC440GRx. A Separate filter, as shown below, is recommended for each voltage.
• The filter should keep the analog voltage to analog ground compression/expansion due to noise less than +/-
50 mV.
• Keep all wire lengths as short as possible.
• Analog grounds must be brought out and connected to the digital ground plane at the filter capacitor.
• The impedance of the ferrite bead should be much greater than that of the capacitor at frequencies where noise is
expected.
AVDD, SAVDD
VDD
L – SMT ferrite bead chip, Murata BLM21PG600SN1
L
C – 0.1μF ceramic
C
AGND, SAGND
GND
Table 14. Typical DC Power Supply Requirements Using DDR2 Memory
+1.5V Supply
(VDD+AVDD+EAVDD
+1.8V Supply
+2.5V Supply
+3.3V Supply
(OVDD+UAVDD)
Frequency (MHz)
Total
Unit
Notes
)
(SOVDD
)
(EOVDD
)
400
533
1.35
1.45
1.9
0.9
0.9
0.9
0.2
0.2
0.2
0.7
0.7
0.7
3.15
3.25
3.7
W
W
W
1
1
1
667
Notes:
1. Typical power is estimated and is based on a nominal voltage of VDD = +1.5V, TC = 85°C, while running Linux and a test application that
exercises each functiion with representative traffic.
Table 15. Typical DC Power Supply Requirements Using DDR1 Memory
+1.5V Supply
(VDD+AVDD+EAVDD
+1.8V Supply
+2.5V Supply
(SOVDD + EOVDD
+3.3V Supply
(OVDD+UAVDD)
Frequency (MHz)
Total
Unit
Notes
)
(SOVDD
)
)
400
533
1.35
1.45
1.9
na
na
na
1.3
1.3
1.3
0.7
0.7
0.7
3.35
3.45
3.9
W
W
W
1
1
1
667
Notes:
1. Typical power is estimated and is based on a nominal voltage of VDD = +1.5V, TC = 85°C, while running Linux and a test application that
exercises each functiion with representative traffic.
AMCC Proprietary
67
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
