AM186 Datasheet, PDF (63/112 Pages) Advanced Micro Devices – High-Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers with RAM

Table 13 shows typical maximum ambient temperatures in degrees Centigrade for a PQFP package used with a
2-layer board. The typical ambient temperatures are based on a 100-degree Centigrade maximum case
temperature. Figure 18 illustrates the typical temperatures in Table 13.
Table 13. Typical Ambient Temperatures for PQFP 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
74.81
80.2
83.56
87.0
Linear Feet per Minute Airflow
200 fpm
400 fpm
78.8
81.43
83.3
85.4
86.2
87.9
89.1
90.4
600 fpm
82.8
86.5
88.7
91.1
94
92
90
88
x
86
84
I
82
80
q
D ^Legend:
s 50 MHz
q 40 MHz
H 33 MHz
x 25 Mhz
78
76
s
74
0 fpm
x
x
T ^x
I
I
I
q
F^q
q
s
s
R ^As
200 fpm
400 fpm
Airflow (Linear Feet Per Minute)
600 fpm
Figure 18. Typical Ambient Temperatures for PQFP with Two-Layer Board
Am186^TMER and Am188^TMER Microcontrollers Data Sheet
63