TS68040 ATMEL Corporation, TS68040 Datasheet - Page 14

• Manufacturer Part Number: TS68040
• Description: 32-bit Mpu, 25-33 MHZ
• Manufacturer: ATMEL Corporation

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Table 10 - Thermal parameters with heat sink and air-flow
Thermal testing summary
Testing proved that a heat sink in combination with a relatively small amount of air-flow (100 LFM or less) will easily realize
a 0-70°C ambient operating temperature for the TS 68040 with almost any configuration of the output buffers. A heat sink
alone may be capable of providing all necessary cooling, depending on the particular heat sink height / size restraints, the
maximum ambient operating temperature required, and the output buffer configuration chosen. Also forced air cooling alone
may attain a 0-70°C ambient operating temperature. However this factor is highly dependent on the output buffer configuration
chosen and the available forced air for cooling. Figure 7 is a summary of the test results of the relationship between
and air-flow for the TS 68040.
3.4.2 - Characteristics guaranted
Table 11
1 000 LFM
1 000 LFM
CQFP 196
100 LFM
250 LFM
500 LFM
750 LFM
100 LFM
250 LFM
500 LFM
750 LFM
PGA 179
Air-flow
Package
Thermal Mgmt.
Technique
Heat sink
2338B
2338B
2338B
2338B
2338B
2338B
2338B
2338B
2338B
2338B
Symbol
J-C
J-C
J-A
J-A
Thermal resistance junction-to-ambient
Thermal resistance junction-to-case
Thermal resistance junction-to-ambient
Thermal resistance junction-to-case
3 W
3 W
3 W
3 W
3 W
5 W
5 W
5 W
5 W
5 W
P D
Defined parameters
Figure 7 : Relationship of
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
T J
Parameter
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
JC
JA air-flow for PGA.
Measured
3.1°C/W
2.2°C/W
1.7°C/W
1.5°C/W
1.4°C/W
3.1°C/W
2.2°C/W
1.7°C/W
1.5°C/W
1.4°C/W
JA
2.1°C/W
1.2°C/W
0.7°C/W
0.5°C/W
0.4°C/W
2.1°C/W
1.2°C/W
0.7°C/W
0.5°C/W
0.4°C/W
CA
See Figure 7
Calculated
Value
TBD
122°C
122°C
122°C
122°C
122°C
120°C
120°C
120°C
120°C
120°C
1
1
T C
115.7°C
118.4°C
119.9°C
120.5°C
120.8°C
109.5°C
116.5°C
117.5°C
114°C
118°C
°C/W
°C/W
°C/W
°C/W
Unit
T A
JA