AM186ED Datasheet, PDF (56/88 Pages) Advanced Micro Devices – High Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers

PRELIMINARY
Table 17 shows typical maximum ambient temperatures in degrees Centigrade for a TQFP package used on a 4-
layer to 6-layer board. The typical ambient temperatures are based on a 100-degree Centigrade maximum case
temperature. Figure 18 graphically illustrates the typical temperatures in Table 17.
Table 17. Typical Ambient Temperatures (°C) for TQFP with a 4-Layer to 6-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
71.7
76.6
82.3
85.8
Linear Feet per Minute Airflow
200 fpm
74.0
78.6
83.8
87.0
400 fpm
76.4
80.5
85.3
88.2
600 fpm
78.8
82.5
86.7
89.4
90
s
s
s
x
s
85
x
x
x
I
T ^I
80
I
q
I
q
F 75
q
A Legend:
q 40 MHz
H 33 MHz
x 25 Mhz
R ^{s 20MHz}
q
70
65
0 fpm
200 fpm
400 fpm
600 fpm
Airflow (Linear Feet Per Minute)
D^{Figure 18. Typical Ambient Temperatures for TQFP with a 4-Layer to 6-Layer Board}
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Am186ED/EDLV Microcontrollers