A40MX02-PL208A ACTEL [Actel Corporation], A40MX02-PL208A Datasheet - Page 19

• Manufacturer Part Number: A40MX02-PL208A
• Description: 40MX and 42MX Automotive FPGA Families
• Manufacturer: ACTEL [Actel Corporation]

Junction Temperature
The temperature variable in the Designer software refers
to
temperature. This is an important distinction because the
heat generated from dynamic power consumption is
usually hotter than the ambient temperature.
be used to calculate junction temperature.
Where:
T
∆T = Temperature gradient between junction (silicon)
and ambient
Table 1-6 • Package Thermal Characteristics
Plastic Packages
Plastic Quad Flat Pack
Plastic Quad Flat Pack
Plastic Quad Flat Pack
Plastic Quad Flat Pack
Plastic Leaded Chip Carrier
Plastic Leaded Chip Carrier
Thin Plastic Quad Flat Pack
Very Thin Plastic Quad Flat Pack
Very Thin Plastic Quad Flat Pack
a
= Ambient Temperature
the
junction
Junction Temperature = ∆T + T
Max. junction temp. (°C) – Max. automotive temp.
---------------------------------------------------------------------------------------------------------------------------------- -
temperature,
not
θ ja (°C/W)
a
(1)
the
Pin Count
100
160
208
240
176
100
EQ 1-3
68
84
80
ambient
EQ 1-3
can
v3.1
12.0
10.0
13.0
12.0
11.0
12.0
10.0
θ
8.0
8.5
jc
∆T =
P = Power
θ
located in the
Package Thermal Characteristics
The device junction-to-case thermal characteristic is θ
and the junction-to-ambient air characteristic is θ
thermal characteristics for θ
different air flow rates.
Maximum junction temperature is 150°C.
A sample calculation of the absolute maximum power
dissipation allowed for a PQFP 160-pin package at
automotive temperature is as follows:
ja
= Junction to ambient of package. θ
θ
ja
=
Still Air
* P
150°C – 125°C
-------------------------------------- -
27.8
26.2
26.1
25.6
25.0
22.5
24.7
35.3
38.2
26.2
40MX and 42MX Automotive FPGA Families
"Package Thermal Characteristics"
°C/W
200 ft./min.
1.0 m/s
23.4
22.8
21.0
18.9
19.9
29.4
22.5
22.3
31.9
θ
=
ja
0.95
W
ja
500 ft./min.
are shown with two
2.5 m/s
21.2
21.1
19.4
17.6
18.0
29.4
27.1
20.8
20.8
ja
numbers are
Units
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
section.
ja
. The
1-15
jc
,