IO137RSB2 datasheet(10/210 Pages) MICROSEMI

10 / 210 page

ProASIC3 Flash Family FPGAs

Re vi s i on 15

2 - 5

The absolute maximum junction temperature is 100°C. EQ 1 shows a sample calculation of the absolute

maximum power dissipation allowed for a 484-pin FBGA package at commercial temperature and in still

air.

EQ 1

Maximum Power Allowed

Max. junction temp. (

°C) Max. ambient temp. (°C)

–

ja(°C/W)

------------------------------------------------------------------------------------------------------------------------------------------

100

°C70°C

–

20.5

°C/W

-------------------------------------

1.463 W

Table 2-5 •

Package Thermal Resistivities

Package Type

Device

Pin Count

θjc

θja

Units

Still Air

200 ft./min.

500 ft./min.

Quad Flat No Lead

A3P030

132

0.4

21.4

16.8

15.3

°C/W

A3P060

132

0.3

21.2

16.6

15.0

°C/W

A3P125

132

0.2

21.1

16.5

14.9

°C/W

A3P250

132

0.1

21.0

16.4

14.8

°C/W

Very Thin Quad Flat Pack (VQFP)

All devices

100

10.0

35.3

29.4

27.1

°C/W

Thin Quad Flat Pack (TQFP)

All devices

144

11.0

33.5

28.0

25.7

°C/W

Plastic Quad Flat Pack (PQFP)

All devices

208

8.0

26.1

22.5

20.8

°C/W

PQFP with embedded heatspreader

All devices

208

3.8

16.2

13.3

11.9

°C/W

Fine Pitch Ball Grid Array (FBGA)

See note*

144

3.8

26.9

22.9

21.5

°C/W

See note*

256

3.8

26.6

22.8

21.5

°C/W

See note*

484

3.2

20.5

17.0

15.9

°C/W

A3P1000

144

6.3

31.6

26.2

24.2

°C/W

A3P1000

256

6.6

28.1

24.4

22.7

°C/W

A3P1000

484

8.0

23.3

19.0

16.7

°C/W

Note:

*This information applies to all ProASIC3 devices except the A3P1000. Detailed device/package thermal

information will be available in future revisions of the datasheet.

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