P R E L I M I N A R Y
Table 14 shows typical maximum ambient temperatures in degrees Centigrade for a PQFP package used on a 2-
layer board. The typical ambient temperatures are based on a 100-degree Centigrade maximum case temperature.
Figure 15 graphically illustrates the typical temperatures in Table 14.
Table 14. Typical Ambient Temperatures (°C) for PQFP with a 2-Layer Board
Linear Feet per Minute Airflow
Microcontroller
Speed
Typical Power
(Watts)
0 fpm
55.2
63.0
72.0
77.6
200 fpm
62.2
400 fpm
67.0
600 fpm
69.3
40 MHz
33 MHz
25 MHz
20 MHz
1.2
1.0
0.7
0.6
68.8
72.7
74.7
76.4
79.4
80.8
81.1
83.5
84.7
90
80
70
60
■
■
■
◆
◆
◆
■
◆
✶
●
✶
●
✶
●
✶
●
50
40
Legend:
● 40 MHz
✵ 33 MHz
◆ 25 Mhz
■ 20 MHz
0 fpm
200 fpm
600 fpm
400 fpm
Airflow (Linear Feet Per Minute)
Figure 15. Typical Ambient Temperatures for PQFP with a 2-Layer Board
Am186ED/EDLV Microcontrollers
53
AMD [ AMD ]
