AM186ED Datasheet, PDF (54/88 Pages) Advanced Micro Devices – High Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers

PRELIMINARY
Table 15 shows typical maximum ambient temperatures in degrees Centigrade for a TQFP package used on a 2-
layer board. The typical ambient temperatures are based on a 100-degree Centigrade maximum case temperature.
Figure 16 graphically illustrates the typical temperatures in Table 15.
Table 15. Typical Ambient Temperatures (°C) for TQFP with a 2-Layer Board
Microcontroller
Speed
40 MHz
33 MHz
25 MHz
20 MHz
Typical Power
(Watts)
1.2
1.0
0.7
0.6
0 fpm
45.7
55.2
66.1
72.9
Linear Feet per Minute Airflow
200 fpm
57.5
65.0
73.5
78.8
400 fpm
64.6
70.8
77.9
82.3
600 fpm
67.0
72.7
79.4
83.5
85
s
s
s
x
x
75
s
x
I
I
T x
q
65
I
q
F q
55
I
A _Legend:
q 40 MHz
H 33 MHz
x 25 Mhz
D ^{R s 20MHz}
45
q
35
0 fpm
200 fpm
400 fpm
600 fpm
Airflow (Linear Feet Per Minute)
Figure 16. Typical Ambient Temperatures for TQFP with a 2-Layer Board
54
Am186ED/EDLV Microcontrollers