MC68HC08AS20 Datasheet, PDF (367/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

21.3 Functional Operating Range
Rating
Operating Temperature Range
Operating Voltage Range
Symbol
Value
Unit
T_A
–40 to 105
°C
V_DD
5.0 ± 10%
V
21.4 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal Resistance
PLCC (52 Pins)
θ_JA
50
°C/W
I/O Pin Power Dissipation
P_I/O
User Determined
W
Power Dissipation (see Note 1)
P_D
P_D = (I_DD x V_DD) +
P_I/O = K/(T_J + 273 °C)
W
Constant (see Note 2)
Average Junction Temperature
Maximum Junction Temperature
K
P_D x
+
((PT_DA2^+x2θ⁷_J³_A)^°C)
W/°C
T_J
T_A = P_D x θ_JA
°C
T_JM
150
°C
NOTES:
1. Power dissipation is a function of temperature.
2. K is a constant unique to the device. K can be determined from a known T_A and measured P_D. With
this value of K, P_D and T_J can be determined for any value of T_A.
MC68HC08AS20 — Rev. 4.1
Freescale Semiconductor
Advance Information
367