a3p1000-1pqg208m Actel Corporation, a3p1000-1pqg208m Datasheet - Page 21

• Manufacturer Part Number: a3p1000-1pqg208m
• Description: Fpga Proasic 3 Family 1m Gates 130nm Cmos Technology 1.5v 208-pin Pqfp
• Manufacturer: Actel Corporation

Table 2-4 • Package Thermal Resistivities
Package Type
Plastic Quad Flat Pack (PQ208)*
Fine Pitch Ball Grid Array (FBGA)
*
Embedded heatspreader
Maximum Power Allowed
Thermal Characteristics
Introduction
The temperature variable in the 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 temperature to be higher than the ambient temperature.
EQ 1
where:
T
ΔT = Temperature gradient between junction (silicon) and ambient ΔT = θ
θ
P = Power dissipation
Package Thermal Characteristics
The device junction-to-case thermal resistivity is θ
θ
junction temperature is 125°C.
dissipation allowed for a 484-pin FBGA package at military temperature and in still air.
A
ja
ja
. The thermal characteristics for θ
= Ambient Temperature
= Junction-to-ambient of the package. θ
T
J
can be used to calculate junction temperature.
= Junction Temperature = ΔT + T
=
Max. junction temp. (°C) Max. ambient temp. (°C)
-------------------------------------------------------------------------------------------------------------------------------------- -
A3PE3000L
A3PE3000L
A3PE600L
A3P1000
A3P1000
Device
EQ 2
shows a sample calculation of the recommended maximum power
ja
A
θ
are shown for two air flow rates. The recommended maximum
ja
Pin Count
(°C/W)
ja
–
R e v i s i o n 0
208
144
484
484
896
numbers are located in
jc
and the junction-to-ambient air thermal resistivity is
3.8
6.3
9.5
4.7
2.4
θ
jc
Still Air 200 ft./min.
16.2
31.6
27.5
20.6
13.6
Military ProASIC3/EL Low Power Flash FPGAs
Table
=
ja
125°C 70°C
------------------------------------
26.2
21.9
15.7
13.3
10.4
2-4.
* P
20.6°C/W
θ
ja
–
500 ft./min.
11.9
24.2
20.2
14.0
=
9.4
2.670
Units
C/W
C/W
C/W
C/W
C/W
EQ 1
EQ 2
2 -7