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Chapter 2 Product Overview
LittleBoard 550 Reference Manual 19
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 300MHz Characteristics 533MHz Characteristics 1GHz Characteristics
Input Type Regulated DC voltages Regulated DC voltages Regulated DC voltages
In-rush* Current
(Typical)
26.9Amps (134.5W) 20.6Amps (103W) 25.9Amps (129.5W)
BIT** Current
(Typical)
1.98Amps (9.92W) 2.51Amps (12.55W) 2.84Amps (14.21W)
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 300MHz Conditions 533MHz Conditions 1GHz Conditions
Operating
+0° to +70°C
(32° to +158°F)
+0° to +70°C
(32° to +158°F)
+0° to +70°C
(32° to +158°F)
Extended
(Optional)
-40° to +85°C
(-40° to +185°F)
-40° to +85°C
(-40° to+185°F)
-40° to +85°C
(-40° to +185°F)
Temperature
Storage –55° to +85°C
(–67° to +185°F)
–55° to +85°C
(–67° to +185°F)
–55° to +85°C
(–67° to +185°F)
Operating 5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing
Humidity
Non-operating 5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing
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.