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Chapter 2
Power Specifications
Table 2-8 shows the power requirements for the LittleBoard, including the I/O interface board.
Table 2-8. Power Supply Requirements
Parameter
Input Type
In-rush* Current
(Typical)
BIT** Current
(Typical)
Notes: *In-rush measured with video, 64MB memory, and power connected. **The BIT (burn in test)
current was derived with 64MB SDRAM, (1) floppy, (1) IDE HDD, (1) on-board 64MB CompactFlash,
I/O Interface board, (2) serial ports w/loopbacks, (1) externally-powered USB CD-ROM, (1) externally-
powered USB HDD, (1) external USB Jump-drive (key-chain CompactFlash type), (1) external USB
CompactFlash Reader with 64MB CompactFlash card, and (2) Ethernet channel connections using
Win2k OS.
Environmental Specifications
Table 2-9 provides the most efficient operating and storage condition ranges required for this board.
Table 2-9. Environmental Requirements
Processor
Operating
Extended
(Optional)
Storage
Operating
Non-operating
Thermal/Cooling Requirements
The CPU, Northbridge, Southbridge, and voltage regulators are the sources of heat on the board.
The LittleBoard 550 is designed to operate at its maximum CPU speed of 300MHz, 533MHz, or
1GHz. All processors and the northbridge require a heatsink, but no fan is required.
LittleBoard 550
300MHz Characteristics
Regulated DC voltages
26.9Amps (134.5W)
1.98Amps (9.92W)
300MHz Conditions
+0° to +70°C
(32° to +158°F)
-40° to +85°C
(-40° to +185°F)
–55° to +85°C
(–67° to +185°F)
5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing
Reference Manual
533MHz Characteristics
Regulated DC voltages
20.6Amps (103W)
2.51Amps (12.55W)
533MHz Conditions
+0° to +70°C
(32° to +158°F)
-40° to +85°C
(-40° to+185°F)
–55° to +85°C
(–67° to +185°F)
5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing
Product Overview
1GHz Characteristics
Regulated DC voltages
25.9Amps (129.5W)
2.84Amps (14.21W)
1GHz Conditions
+0° to +70°C
(32° to +158°F)
-40° to +85°C
(-40° to +185°F)
–55° to +85°C
(–67° to +185°F)
5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing
19
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