MC68040FE25V Freescale Semiconductor, MC68040FE25V Datasheet - Page 348
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MC68040FE25V
Manufacturer Part Number
MC68040FE25V
Description
IC MICROPROCESSOR 32BIT 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040FE33A.pdf
(442 pages)
Specifications of MC68040FE25V
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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All pin-fin heat sinks tested were made from extrusion aluminum products. The planar face
of the heat-sink matting to the package should have a good degree of planarity; if it has
any curvature, the curvature should be convex at the central region of the heat-sink
surface to provide intimate physical contact to the PGA surface. This heat sinks meet this
criteria. Nonplanar, concave curvature in the central regions of the heat sink results in
poor thermal contact to the package.
Although there are several ways to attach a heat sink to the package, it is easiest to use a
demountable heat-sink attachment called “E-Z attach for PGA packages” (see Figure 11-
33). A steel spring clamps the heat sink and the package to a plastic frame. Besides the
height of the heat sink and plastic frame, no additional height is added to the package.
The interface between the ceramic package and the aluminum heat sink was evaluated
for both dry and wet interfaces in still air. The thermal grease reduced the
significantly (about 2.5 C/W) in still air. An attachment with thermal grease provided
about the same thermal performance as if a thermal epoxy had been used.
11-20
NOTE: Do not cover up microprocessor markings with an adhesive mounted heat sink.
Figure 11-10. Heat Sink with Adhesive
Freescale Semiconductor, Inc.
For More Information On This Product,
M68040 USER’S MANUAL
Go to: www.freescale.com
HEAT SINK
PIN GRID
ARRAY
MOTOROLA
CA
quite
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