A54SX08-1BG208 ETC1 [List of Unclassifed Manufacturers], A54SX08-1BG208 Datasheet - Page 21

• Manufacturer Part Number: A54SX08-1BG208
• Description: 54SX Family FPGAs
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

5 4 S X F a m i l y F PG A s
J un c t i on T e m p e ra t u re ( T
The temperature that you select in Designer Series software
is the junction temperature, not ambient temperature. This
is an important distinction because the heat generated from
dynamic power consumption is usually hotter than the
ambient temperature. Use the equation below to calculate
junction temperature.
Where:
T
∆T = Temperature gradient between junction (silicon) and
ambient
∆T =
Package Type
Plastic Leaded Chip Carrier (PLCC)
Thin Quad Flat Pack (TQFP)
Thin Quad Flat Pack (TQFP)
Very Thin Quad Flatpack (VQFP)
Plastic Quad Flat Pack (PQFP) without Heat Spreader
Plastic Quad Flat Pack (PQFP) with Heat Spreader
Plastic Ball Grid Array (PBGA)
Plastic Ball Grid Array (PBGA)
Plastic Ball Grid Array (PBGA)
Fine Pitch Ball Grid Array (FBGA)
Note:
a
= Ambient Temperature
θ
ja
SX08 does not have a heat spreader.
* P
Maximum Power Allowed
Junction Temperature = ∆T + T
=
Max. junction temp. (°C) – Max. ambient temp. (°C)
------------------------------------------------------------------------------------------------------------------------------
J
)
a
θ
ja
Pin Count
(°C/W)
v3.1
144
176
100
272
313
329
144
208
208
84
P = Power calculated from Estimating Power Consumption
section
θ
located in Package Thermal Characteristics section.
P a ck a g e T he r m a l C h a r ac t e ri s ti cs
The device junction to case thermal characteristic is θ
and the junction to ambient air characteristic is θ
thermal characteristics for θ
air flow rates.
The maximum junction temperature is 150°C.
A sample calculation of the absolute maximum power
dissipation allowed for a TQFP 176-pin package at
commercial temperature and still air is as follows:
ja
= Junction to ambient of package.
3.8
3.8
θ
10
12
11
11
8
3
3
3
jc
=
Still Air
150°C – 70°C
---------------------------------
38.8
θ
32
32
28
38
20
23
18
30
20
28°C/W
ja
ja
are shown with two different
300 ft/min
=
14.5
13.5
26.7
θ
22
24
21
32
23
17
17
2.86W
ja
θ
ja
numbers are
Units
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
ja
. The
21
jc
,