AM188ES-40KCW Datasheet, PDF (60/102 Pages) Advanced Micro Devices – High Performance, 80C186-/80C188-Compatible and 80L186-/80L188-Compatible, 16-Bit Embedded Microcontrollers

PRELIMINARY
Table 16 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 16.
Table 16. Typical Ambient Temperatures for TQFP with a 4-Layer to 6-Layer Board
Microcontroller
Speed
40 MHz
33 MHz
25 MHz
20 MHz
Typical Power
(Watts)
1.239
1.07085
0.81125
0.649
0 fpm
70.264
74.2996
80.53
84.424
Linear Feet per Minute Airflow
200 fpm
72.742
76.4413
82.1525
85.722
400 fpm
75.22
78.583
83.775
87.02
600 fpm
77.698
80.7247
85.3975
88.318
95
90
s
s
s
x
85
s
x
x
80
Legend:
q 40 MHz
H 33 MHz
x 25 Mhz
s 20 MHz
75
I
70
q
0 fpm
x
I
q
200 fpm
I
q
400 fpm
I
q
600 fpm
Airflow (Linear Feet Per Minute)
Figure 18. Typical Ambient Temperatures for TQFP with a 4-Layer to 6-Layer Board
60
Am186/188ES and Am186/188ESLV Microcontrollers