MC68LC040RC25A Freescale Semiconductor, MC68LC040RC25A Datasheet - Page 346

• Manufacturer Part Number: MC68LC040RC25A
• Description: IC MPU 32BIT 25MHZ 179-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68LC040RC25A

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

11.9.2 Forced Air
In this study, a small sample of MC68040 packages was tested in forced-air cooling in a
wind tunnel with no heat sink. The test was performed with approximately 6 W of power
being dissipated from within the package. As previously mentioned, since the variance in
purposes that
lists the results of the maximum power dissipation at maximum
heat sink for the MC68040, and Table 11-4 lists the results for the MC68LC040 and
MC68EC040. Refer to Table 11-1 for calculating other power dissipation values.
11-18
JA
MHz
25
25
25
33
33
33
25
25
25
33
33
33
25
25
25
33
33
33
25
25
25
33
33
33
25
25
25
33
33
33
within the possible power range is negligible, it can be assumed for calculation
Airflow Velocity
Thermal Mgmt.
Technique
1000 LFM
100 LFM
250 LFM
500 LFM
750 LFM
JA
Table 11-3. Thermal Parameters with Forced Airflow
is constant at all power levels. Using the previous equations, Table 11-3
Freescale Semiconductor, Inc.
10.0 W
10.0 W
10.0 W
10.0 W
10.0 W
and No Heat Sink for the MC68040
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
For More Information On This Product,
P
D
Defined Parameters
M68040 USER’S MANUAL
Go to: www.freescale.com
110 C
110 C
110 C
110 C
110 C
T
J
3 C/W
3 C/W
3 C/W
3 C/W
3 C/W
JC
Measured
12.7 C/W
11.0 C/W
9.9 C/W
9.5 C/W
9.3 C/W
JA
9.7 C/W
8.0 C/W
6.9 C/W
6.5 C/W
6.3 C/W
JC
CA
with airflow and no
Calculated
91.1 C
90.2 C
84.9 C
86.9 C
86.0 C
80.0 C
91.1 C
90.2 C
84.2 C
86.9 C
86.0 C
80.0 C
91.1 C
90.2 C
84.2 C
86.9 C
86.0 C
80.0 C
91.1 C
90.2 C
84.2 C
86.9 C
86.0 C
80.0 C
91.1 C
90.2 C
84.2 C
86.9 C
80.0 C
81.8 C
T
C
MOTOROLA
29.90 C
26.18 C
00.76 C
12.21 C
08.40 C
40.70 C
37.40 C
15.40 C
25.30 C
22.00 C
00.00 C
47.63 C
44.66 C
24.86 C
33.77 C
30.80 C
11.00 C
50.15 C
47.30 C
28.30 C
36.85 C
34.00 C
15.00 C
51.41 C
48.62 C
30.02 C
38.39 C
17.00 C
22.58 C
00.00 C
T
A