XC3S100E_06 Datasheet, PDF (166/231 Pages) Xilinx, Inc – Configurable Logic Block (CLB)

Pinout Descriptions
R
Package Thermal Characteristics
The power dissipated by an FPGA application has implica-
tions on package selection and system design. The power
consumed by a Spartan-3E FPGA is reported using either
the XPower Estimator or the XPower calculator integrated in
the Xilinx ISE development software. Table 129 provides the
thermal characteristics for the various Spartan-3E package
offerings.
The junction-to-case thermal resistance (θ_JC) indicates the
difference between the temperature measured on the pack-
age body (case) and the die junction temperature per watt
of power consumption. The junction-to-board (θ_JB) value
similarly reports the difference between the board and junc-
tion temperature. The junction-to-ambient (θ_JA) value
reports the temperature difference per watt between the
ambient environment and the junction temperature. The θ_JA
value is reported at different air velocities, measured in lin-
ear feet per minute (LFM). The “Still Air (0 LFM)” column
shows the θ_JA value in a system without a fan. The thermal
resistance drops with increasing air flow.
Table 129: Spartan-3E Package Thermal Characteristics
Package
VQ100
Device
XC3S100E
Junction-to-Case
(θ_JC)
13.0
Junction-to-
Board (θ_JB)
30.9
XC3S250E
11.0
25.9
CP132 XC3S100E
19.3
42.0
XC3S250E
11.8
28.4
XC3S500E
8.5
21.1
TQ144 XC3S100E
8.2
31.9
XC3S250E
7.2
25.7
PQ208 XC3S250E
9.8
29.0
XC3S500E
8.5
26.8
FT256 XC3S250E
12.4
27.6
XC3S500E
9.7
22.3
XC3S1200E
6.5
16.4
FG320 XC3S500E
13.0
17.1
XC3S1200E
10.2
13.8
XC3S1600E
8.8
12.1
FG400 XC3S1200E
9.7
13.5
XC3S1600E
8.3
11.6
FG484 XC3S1600E
7.8
11.3
Junction-to-Ambient (θ_JA)
at Different Air Flows
Still Air
(0 LFM) 250 LFM 500 LFM 750 LFM Units
49.0
40.7
37.9
37.0 °C/Watt
43.3
36.0
33.6
32.7 °C/Watt
62.1
55.3
52.8
51.2 °C/Watt
48.5
42.0
39.6
38.1 °C/Watt
41.4
35.0
32.8
31.4 °C/Watt
52.1
40.5
34.6
32.5 °C/Watt
37.6
29.2
25.0
23.4 °C/Watt
37.0
27.3
24.1
22.4 °C/Watt
36.1
26.6
23.6
21.8 °C/Watt
35.8
29.4
28.4
28.1 °C/Watt
31.1
25.0
24.0
23.6 °C/Watt
26.3
20.6
19.4
19.0 °C/Watt
25.9
20.4
19.2
18.5 °C/Watt
22.7
17.4
16.1
15.4 °C/Watt
20.8
15.3
14.0
13.3 °C/Watt
22.2
17.1
15.9
15.2 °C/Watt
20.1
15.1
13.9
13.2 °C/Watt
16.7
12.2
11.0
10.5 °C/Watt
166
www.xilinx.com
DS312-4 (v3.4) November 9, 2006
Product Specification