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A1225A-2PG160M Datasheet(PDF) 9 Page - Microsemi Corporation |
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A1225A-2PG160M Datasheet(HTML) 9 Page - Microsemi Corporation |
9 / 54 page ACT 2 Family FPGAs R e visio n 8 2 -3 Package Thermal Characteristics The device junction to case thermal characteristic is θjc, and the junction to ambient air characteristic is θja. The thermal characteristics for θja are shown with two different air flow rates. Maximum junction temperature is 150 °C. A sample calculation of the absolute maximum power dissipation allowed for a PQ160 package at commercial temperature and still air is as follows: EQ 1 Power Dissipation P = [ICC standby + ICCactive] * VCC + IOL * VOL * N + IOH* (VCC – VOH) * M EQ 2 where: ICC standby is the current flowing when no inputs or outputs are changing ICCactive is the current flowing due to CMOS switching. IOL and IOH are TTL sink/source currents. VOL and VOH are TTL level output voltages. N is the number of outputs driving TTL loads to VOL. M is the number of outputs driving TTL loads to VOH. An accurate determination of N and M is problematical because their values depend on the family type, design details, and on the system I/O. The power can be divided into two components: static and active. Table 2-4 • Package Thermal Characteristics Package Type* Pin Count θ jc θ ja Still Air θ ja 300 ft./min. Units Ceramic Pin Grid Array 100 5 35 17 °C/W 132 5 30 15 °C/W 176 8 23 12 °C/W Ceramic Quad Flatpack 172 8 25 15 °C/W Plastic Quad Flatpack1 100 13 48 40 °C/W 144 15 40 32 °C/W 160 15 38 30 °C/W Plastic Leaded Chip Carrier 84 12 37 28 °C/W Very Thin Quad Flatpack 100 12 43 35 °C/W Thin Quad Flatpack 176 15 32 25 °C/W Notes: (Maximum Power in Still Air) 1. Maximum power dissipation values for PQFP packages are 1.9 W (PQ100), 2.3 W (PQ144), and 2.4 W (PQ160). 2. Maximum power dissipation for PLCC packages is 2.7 W. 3. Maximum power dissipation for VQFP packages is 2.3 W. 4. Maximum power dissipation for TQFP packages is 3.1 W. Max. junction temp. (°C) Max. ambient temp. (°C) – θ ja°C/W --------------------------------------------------------------------------------------------------------------------------------------- 150°C 70°C – 33°C/W ------------------------------------ 2.4 W == |
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