AM186 Datasheet, PDF (64/112 Pages) Advanced Micro Devices – High-Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers with RAM

Table 14 shows typical maximum ambient temperatures in degrees Centigrade for a TQFP package used with a
2-layer board. The typical ambient temperatures are based on a 100-degree Centigrade maximum case
temperature. Figure 19 illustrates the typical temperatures in Table 14.
Table 14. Typical Ambient Temperatures for TQFP with Two-Layer Board
Microcontroller
Speed
50 MHz
40 MHz
33 MHz
25 MHz
Typical Power
(Watts)
0.662
0.522
0.432
0.342
0 fpm
69.5
76.0
80.1
84.2
Linear Feet per Minute Airflow
200 fpm
400 fpm
76.1
80.1
81.2
84.3
84.4
87.0
87.7
89.7
600 fpm
81.4
85.4
87.9
90.4
95
90
85
x
80
I
q
D⁷⁵
Legend:
s 50 MHz
70
s
q 40 MHz
H 33 MHz
x 25 Mhz
65
0 fpm
x
x
T _x
I
I
q
F ^I
q
q
s
s
R ^As
200 fpm
400 fpm
Airflow (Linear Feet Per Minute)
600 fpm
Figure 19. Typical Ambient Temperatures for TQFP with Two-Layer Board
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Am186^TMER and Am188^TMER Microcontrollers Data Sheet