Specifications

3–2 Power and Environmental Requirements
Subject to Change – 17 January 1997
Environmental Requirements
3.2 Environmental Requirements
The 21164 microprocessor is cooled by a small fan blowing directly into the chip’s
heat sink. The AlphaPC 164 is designed to run efficiently using only this fan.
Additional fans may be necessary depending upon cabinetry and I/O board
requirements. Such fans (12 V dc) may be connected to J2 and J22.
The AlphaPC 164 is specified to run within the following environment:
3.3 Board Dimensions
The AlphaPC 164 is an ATX-size printed-wiring board (PWB) with the following
dimensions:
•
Width: 24.38 cm (9.6 in. ±0.0005 in.)
•
Length: 30.48 cm (12.0 in. ±0.0005 in.)
•
Height: 6.0 cm (2.4 in.)
The board can be used in certain desktop and deskside systems that have adequate
clearance for the 21164 heat sink and its cooling fan. All ISA and PCI expansion
slots are usable in standard desktop or deskside enclosures.
Parameter Specification
Operating temperature 10°C to 40°C (50°F to 104°F)
Storage temperature –55°C to 125°C (–67°F to 257°F)
Relative humidity 10% to 90% with maximum wet bulb temperature 28°C
(82°F) and minimum dew point 2°C (36°F)
Rate of (dry bulb) temperature
change
11°C/hour ±2°C/hour (20°F/hour ±4°F/hour)