MC908AP32CFBE Datasheet, PDF (300/324 Pages) Freescale Semiconductor, Inc – The following revision history table summarizes changes contained in this document. For your convenience, the page number designators have been linked to the appropriate location.

Electrical Specifications
22.3 Functional Operating Range
Table 22-2. Operating Range
Characteristic
Symbol
Value
Unit
Operating temperature range
T_A
– 40 to +85
°C
Operating voltage range
V_DD
2.7 to 5.5
V
22.4 Thermal Characteristics
Table 22-3. Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal resistance
42-Pin SDIP
44-Pin QFP
θ_JA
48-Pin LQFP
60
°C/W
95
°C/W
80
°C/W
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
Maximum junction temperature
T_JM
100
°C
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.
MC68HC908AP Family Data Sheet, Rev. 4
298
Freescale Semiconductor