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General Information

more favorable thermal conditions, it may be possible to operate the module reliably at higher than 55û C with increased airflow. It is important to note that there are several factors, in addition to the rated CFM of the air mover, which determine the actual volume and speed of air flowing over a module.

Forced air cooling is required for the Atlas motherboard. Additional cooling is required with the installation of the MPC604 RISC processor. A 3-pin header (J17) is provided on the motherboard for powering a dedicated fan. Refer to the Cooling Requirements section in the General Information chapter for temperature qualification information for the system board platform.

Table 1-3. MVME177 Specifications

Characteristics

SpeciÞcations

 

 

Power requirements

+5 Vdc (± 5%), 4.5 A (typical), 6.0 A (max.)

(with both EPROM

(at 50 MHz, with 128MB ECC DRAM)

sockets populated and

±

excluding external

+12 Vdc ( 5%), 100 mA (max.)

(1.0 A (max.) with offboard LAN

LAN transceiver)

transceiver)

 

-12 Vdc (± 5%), 100 mA (max.)

 

 

Operating temperature (refer to

0û to 55û C at point of entry of forced air

Cooling Requirements section)

(approximately 490 LFM)

 

 

Storage temperature

-40û to +85û C

 

 

Relative humidity

5% to 90% (non-condensing)

 

 

Physical dimensions

Double-high VMEboard

PC board with mezzanine

 

module only

 

Height

9.187 inches (233.35 mm)

Depth

6.299 inches (160.00 mm)

Thickness

0.662 inches (16.77 mm)

PC boards with connectors and

 

front panel

 

Height

10.309 inches (261.85 mm)

Depth

7.4 inches (188 mm)

Thickness

0.80 inches (20.32 mm)

 

 

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Motorola manual MVME177 Specifications, Characteristics SpeciÞcations