MC68HC908LJ12 Datasheet, PDF (392/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Electrical Specifications
23.4 Functional Operating Range
Table 23-2. Operating Range
Characteristic
Symbol
Value
Unit
Operating temperature range
T_A
– 40 to +85
°C
Operating voltage range
V_DD
3.3V ± 10%
5.0V ± 10%
V
23.5 Thermal Characteristics
Table 23-3. Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal resistance
52-pin LQFP
64-pin LQFP
64-pin QFP
85
θ_JA
80
°C/W
70
I/O pin power dissipation
P_I/O
User determined
W
Power dissipation⁽¹⁾
P_D
P_D = (I_DD × V_DD) + P_I/O =
K/(T_J + 273 °C)
W
Constant⁽²⁾
K
P_D x (T_A + 273 °C)
+ P_D2 × θ_JA
W/°C
Average junction temperature
T_J
T_A + (P_D × θ_JA)
°C
Notes:
1. Power dissipation is a function of temperature.
2. K constant unique to the device. K can be determined for 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.
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor
Electrical Specifications
Technical Data
393