a3p250l Actel Corporation, a3p250l Datasheet - Page 18

• Manufacturer Part Number: a3p250l
• Description: Proasic3l Low-power Flash Fpgas With Flash*freeze Technology
• Manufacturer: Actel Corporation

ProASIC3L DC and Switching Characteristics
Table 2-5 •
2 -6
Package Type
Very Thin Quad Flat Pack (VQFP)
Plastic Quad Flat Pack (PQFP)
PQFP with embedded heatspreader
Fine Pitch Ball Grid Array (FBGA)
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 2-1
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
resistivity is θ
maximum junction temperature is 100°C.
maximum power dissipation allowed for a 484-pin FBGA package at commercial temperature and
in still air.
Package Thermal Resistivities
A
ja
= Ambient Temperature
= Junction-to-ambient of the package. θ
T
J
= Junction Temperature = ΔT + T
can be used to calculate junction temperature.
ja
=
. The thermal characteristics for θ
Max. junction temp. (°C) Max. ambient temp. (°C)
-------------------------------------------------------------------------------------------------------------------------------------- -
A3PE3000L
A3PE3000L
All devices
All devices
All devices
AGLE3000
A3P1000L
A3P1000L
A3P1000L
A3P250L
A3P600L
A3P250L
A3P600L
A3P600L
Device
A
θ
A dv a n c e v 0. 4
ja
(°C/W)
Pin Count
–
100
208
208
144
144
144
256
256
256
324
484
484
484
896
ja
EQ 2-2
numbers are located in
ja
10.0
12.2
12.0
TBD
are shown for two air flow rates. The absolute
8.0
3.8
8.3
6.3
6.6
9.5
8.0
4.7
2.4
θ
8.5
shows a sample calculation of the absolute
jc
jc
and the junction-to-ambient air thermal
Still Air 200 ft./min. 500 ft./min.
35.3
16.2
31.6
28.1
27.5
23.3
20.6
26.1
TBD
13.6
43.8
35.8
38.6
32.0
=
100°C 70°C
------------------------------------
Table
29.4
22.5
13.3
26.2
24.4
TBD
21.9
19.0
15.7
10.4
20.5°C/W
37.7
30.2
34.7
27.5
θ
ja
ja
–
2-5.
* P
=
27.1
20.8
11.9
35.8
28.3
24.2
33.0
25.8
TBD
20.2
16.7
14.0
22.7
9.4
1.463 W
EQ 2-1
EQ 2-2
Units
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W