參數(shù)資料
型號(hào)： M7A3PE600-FFG484I
元件分類： FPGA
英文描述： FPGA, 600000 GATES, PBGA484
封裝： 1 MM PITCH, FBGA-484
文件頁數(shù)： 139/168頁
文件大?。?/td> 1335K
代理商： M7A3PE600-FFG484I
ProASIC3E Flash Family FPGAs
3- 4
A dvanced v0. 5
Thermal Characteristics
Introduction
The temperature variable in Actel 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 3-1 can be used to calculate junction temperature.
TJ = Junction Temperature = T + TA
EQ 3-1
Where:
TA = Ambient Temperature
T = Temperature gradient between junction (silicon)
and ambient
T = θ
ja * P
θ
ja = Junction-to-ambient of the package. θja numbers
are located in Table 3-5.
P = Power dissipation
Package Thermal Characteristics
The device junction-to-case thermal resistivity is
θ
jc and
the junction-to-ambient air thermal resistivity is
θ
ja. The
thermal characteristics for
θ
ja are shown for two air flow
rates. The absolute maximum junction temperature is
110°C. EQ 3-2 shows a sample calculation of the absolute
maximum power dissipation allowed for an 896-pin
FBGA package at commercial temperature and still air.
EQ 3-2
Temperature and Voltage Derating Factors
Table 3-5
Package Thermal Resistivities
Package Type
Pin Count
θ
jc
θ
ja
Units
Still Air
200 ft./min. 500 ft./min.
Plastic Quad Flat Package (PQFP)
208
8.0
26.1
22.5
20.8
C/W
Plastic Quad Flat Package (PQFP) with
embedded heat spreader
208
3.8
16.2
13.3
11.9
C/W
Fine Pitch Ball Grid Array (FBGA)
256
3.8
26.6
22.8
21.5
C/W
484
3.2
20.5
17.0
15.9
C/W
676
3.2
16.4
13.0
12.0
C/W
896
2.4
13.6
10.4
9.4
C/W
Table 3-6
Temperature and Voltage Derating Factors for Timing Delays
(Normalized to TJ = 70°C, VCC = 1.425 V)
Array Voltage
VCC (V)
Junction Temperature (°C)
–40°C
0°C
25°C
70°C
85°C
100°C
1.425
0.87
0.93
0.95
1.00
1.02
1.05
1.500
0.83
0.88
0.90
0.95
0.96
0.99
1.575
0.80
0.84
0.87
0.91
0.93
0.96
Maximum Power Allowed
Max. junction temp. (
°C) Max. ambient temp. (°C)
–
θ
ja(°C/W)
---------------------------------------------------------------------------------------------------------------------------------------
150
°C70°C
–
13.6
°C/W
------------------------------------
5.88 W
=
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