AM188ES-40KCW Datasheet, PDF (59/102 Pages) Advanced Micro Devices – High Performance, 80C186-/80C188-Compatible and 80L186-/80L188-Compatible, 16-Bit Embedded Microcontrollers

PRELIMINARY
Table 15 shows typical maximum ambient temperatures in degrees Centigrade for a PQFP 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 17 graphically illustrates the typical temperatures in Table 15.
Table 15. Typical Ambient Temperatures for PQFP 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
77.698
80.7247
85.3975
88.318
Linear Feet per Minute Airflow
200 fpm
80.176
82.8664
87.02
89.616
400 fpm
82.654
85.0081
88.6425
90.914
600 fpm
85.132
87.1498
90.265
92.212
95
s
s
90
s
x
s
x
x
I
x
85
I
q
I
q
I
80
q
q
Legend:
q 40 MHz
H 33 MHz
x 25 Mhz
s 20 MHz
75
70
0 fpm
200 fpm
400 fpm
Airflow (Linear Feet Per Minute)
600 fpm
Figure 17. Typical Ambient Temperatures for PQFP with a 4-Layer to 6-Layer Board
Am186/188ES and Am186/188ESLV Microcontrollers
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