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Environmental Requirements
Caution:
Fan sensor required. The 21264 microprocessor cooling fan must have
a built-in sensor that will drive a signal if the airflow stops. The sensor is
connected to power connector J1. When the signal is generated, it resets
the system.
3.2 Environmental Requirements
The 21264 microprocessor is cooled by a small fan blowing directly into the chip's
heat sink. The daughtercard is designed to run efficiently by using only this fan.
Additional fans may be necessary depending upon cabinetry and the requirements of
plug-in cards.
The AlphaPC 264DP mainboard and daughtercard are specified to run within the
environment listed in Table 3–2.
Table 3–2 AlphaPC 264DP Environmental Requirements
Parameter
Operating temperature
Storage temperature
Relative humidity
Rate of (dry bulb) temperature change 11°C/hour
3.3 Physical Parameters
The mainboard is a printed-wiring board (PWB) with the following dimensions:
•
Length: 42.11 cm (16.58 in ±0.0005 in)
•
Width: 33.02 cm (13.0 in ±0.0005 in)
•
Height: 3.81 cm (1.5 in)
The daughtercard is a PWB with the following dimensions:
•
Length: 30.48 cm (12.0 in ±0.0005 in)
•
Width: 14.99 cm (5.905 in ±0.0005 in)
•
Height: 6.40 cm (2.52 in ±0.0005 in)
Power and Environmental Requirements
3–2
Specification
10°C to 40°C (50°F to 104°F)
–55°C to 125°C (–67°F to 257°F)
10% to 90% with maximum wet bulb temperature
28°C (82°F) and minimum dew point 2°C (36°F)
±
2°C/hour (20°F/hour
12 February 1999 – Subject To Change
±
4°F/hour)
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