MC68EC040RC25A Freescale Semiconductor, MC68EC040RC25A Datasheet - Page 345

• Manufacturer Part Number: MC68EC040RC25A
• Description: IC MPU 32BIT 25MHZ 179-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC040RC25A

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 179-PGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

11.9.1 Still Air
In this study, a small sample of MC68040 packages was tested in free-air cooling with no
heat sink. Measurements showed that the average
deviation of 0.44 C/W. The test was performed with approximately 6 W of power being
dissipated from within the package. The test determined that
increasing power dissipation range possible. Therefore, since the variance in
the possible power dissipation range is negligible, it can be assumed for calculation
purposes that
lists the results of a maximum power dissipation at maximum
airflow (see Table 11-1 to calculate other power dissipation values). The ambient
temperature results illustrate the need to implement some type of thermal management to
obtain a reasonable maximum ambient temperature.
MOTOROLA
d. For the example c system running the data bus in small buffer mode with other
MHz
25
25
25
33
33
33
20
25
33
outputs in large buffer mode terminated:
P = (Number of Pins Large Buffer High)
= 19.1 Pins
= 0.94 W
= 0.14 W
Low)
Small Buffer Low)
mW per Pin + 10.7 Pins
Table 11-2. Thermal Parameters with No Heat Sink or Airflow
10.0
6.3
6.6
8.6
7.7
8.0
6.3
P
4
5
D
JA
Defined Parameters
(P llb ) + (Number of Pins Small Buffer High)
is valid at all power levels. Using the previous equations, Table 11-2
(1 – 0.85)
110 C
110 C
110 C
110 C
110 C
110 C
110 C
110 C
110 C
30.1 mW per Pin + 23.8 Pins
T
Freescale Semiconductor, Inc.
J
For More Information On This Product,
(P lsb )
JC
3
3
3
3
3
3
3
3
3
Go to: www.freescale.com
M68040 USER’S MANUAL
MC68LC040 and MC68EC040
0.625 mW per Pin
Measured
22.8
22.8
22.8
22.8
22.8
22.8
22.8
22.8
22.8
MC68040
JA
(P hlb ) + (Number of Pins Large Buffer
(
JA
19.8
19.8
19.8
19.8
19.8
19.8
19.8
19.8
19.8
14.8 mW per Pin + 10.7 Pins
CA
–
JA
JC
)
was 22.8 C/W with a standard
JA
(T
(P hsb ) + (Number of Pins
Calculated
J
decreases slightly for the
– P
JC
91.1
90.2
84.2
86.9
86.0
80.0
91.1
T
98
95
D
C
with no heat sink or
JC
)
(T
J
–118.00
– P
–33.64
–40.48
–86.08
–65.56
–72.40
–33.64
18.8
JA
T
–4
D
A
within
0.625
JA
11-17
)