TS68040VR33A Atmel, TS68040VR33A Datasheet - Page 13

• Manufacturer Part Number: TS68040VR33A
• Description: IC MPU 32BIT 33MHZ 179PGA
• Manufacturer: Atmel

Specifications of TS68040VR33A

• Processor Type: 68000 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 179-PGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Thermal Characteristics in
Still Air
Table 7. Thermal Parameters With No Heat Sink or Air-flow
Thermal Characteristics in
Forced Air
Table 8. Thermal Parameters With Forced Air Flow and No Heat Sink
2116A–HIREL–09/02
Air-flow velocity
Thermal Mgmt.
3 Watts
5 Watts
Technique
1000 LFM
1000 LFM
100 LFM
250 LFM
500 LFM
750 LFM
100 LFM
250 LFM
500 LFM
750 LFM
P
D
Defined Parameters
125°C
125°C
T
J
3W
3W
3W
3W
3W
5W
5W
5W
5W
5W
P
D
Defined Parameters
A sample size of three TS68040 packages was tested in free-air cooling with no heat
sink. Measurements showed that the average
tion of 0.44°C/W. The test was performed with 3W of power being dissipated from within
the package. The test determined that
dissipation range possible. Therefore, since the variance in
power dissipation range is negligible, it can be assumed for calculation purposes that
the results of a maximum power dissipation of 3 and 5W with no heat sink or air-flow
(refer to Table 6 to calculate other power dissipation values).
As seen by looking at the ambient temperature results, most users will want to imple-
ment some type of thermal management to obtain a more reasonable maximum
ambient temperature.
A sample size of three TS68040 packages was tested in forced air cooling in a wind tun-
nel with no heat sink. This test was performed with 3W of power being dissipated from
within the package. As previously mentioned, since the variance in JA within the possi-
ble power range is negligible, it can be assumed for calculation purposes that
constant at all power levels. Using the previous formulas, Table 8 shows the results of
the maximum power dissipation at 3 and 5W with air-flow and no heat sink (refer to
Table 6 to calculate other power dissipation values).
1°C/W
1°C/W
JA
JC
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
is valid at all power levels. Using the formulas introduced previously, Table 7 shows
T
J
Measured
21.8°C/W
21.8°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
JA
JC
Measured
CA
11.7°C/W
11.7°C/W
8.9°C/W
8.5°C/W
8.3°C/W
8.9°C/W
8.5°C/W
8.3°C/W
10°C/W
10°C/W
20.8°C/W
20.8°C/W
=
JA
JA
-
JA
JC
will decrease slightly for the increasing power
10.7°C/W
10.7°C/W
7.9°C/W
7.5°C/W
7.3°C/W
7.9°C/W
7.5°C/W
7.3°C/W
9°C/W,
9°C/W
JA
T
CA
was 22.8°C/W with a standard devia-
C
Calculated
= T
122°C
120°C
J
- P
D
Calculated
*
122°C
122°C
122°C
122°C
122°C
120°C
120°C
120°C
120°C
120°C
JC
T
JA
C
within the possible
T
A
TS68040
= T
59.6°C
16°C
J
100.1°C
- P
89.9°C
98.3°C
99.5°C
66.5°C
80.5°C
82.5°C
83.5°C
95°C
75°C
T
D
A
*
JA
JA
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