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ProASIC3 nano Flash FPGAs
Revision 11
2-5
Thermal Characteristics
Introduction
The temperature variable in the Designer software refers to the junction temperature, not the ambient
temperature. This is an important distinction because dynamic and static power consumption cause the
chip junction to be higher than the ambient temperature.
EQ 1 can be used to calculate junction temperature.
TJ = Junction Temperature = T + TA
EQ 1
where:
TA = Ambient Temperature
T = Temperature gradient between junction (silicon) and ambient T = ja * P
ja = Junction-to-ambient of the package. ja numbers are located in Table 2-5.
P = Power dissipation
Package Thermal Characteristics
The device junction-to-case thermal resistivity is
jc and the junction-to-ambient air thermal resistivity is
ja. The thermal characteristics for ja are shown for two air flow rates. The absolute maximum junction
temperature is 100掳C. EQ 2 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 2
Temperature and Voltage Derating Factors
Maximum Power Allowed
Max. junction temp. (
C) Max. ambient temp. (C)
鈥�
ja(C/W)
------------------------------------------------------------------------------------------------------------------------------------------
100
C70C
鈥�
20.5
C/W
-------------------------------------
1.463 W
=
Table 2-5 Package Thermal Resistivities
Package Type
Device
Pin Count
jc
ja
Units
Still Air 200 ft./min.
500 ft./min.
Quad Flat No Lead (QFN)
All devices
48
TBD
C/W
68
TBD
C/W
100
TBD
C/W
Very Thin Quad Flat Pack (VQFP)
All devices
100
10.0
35.3
29.4
27.1
C/W
Table 2-6 Temperature and Voltage Derating Factors for Timing Delays
(normalized to TJ = 70掳C, VCC = 1.425 V)
Array Voltage VCC (V)
Junction Temperature (掳C)
鈥�40掳C
鈥�20掳C
0掳C
25掳C
70掳C
85掳C
100掳C
1.425
0.968
0.973
0.979
0.991
1.000
1.006
1.013
1.500
0.888
0.894
0.899
0.910
0.919
0.924
0.930
1.575
0.836
0.841
0.845
0.856
0.864
0.870
0.875
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A3P250-VQ100 IC FPGA 1KB FLASH 250K 100-VQFP
A3PN125-VQG100I IC FPGA NANO 125K GATES 100-VQFP
HMC35DRYS-S734 CONN EDGECARD 70POS DIP .100 SLD
HBC65DRYS-S734 CONN EDGECARD 130PS DIP .100 SLD
GMC15DTEF CONN EDGECARD 30POS .100 EYELET
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