MC68HC908BD48 Datasheet, PDF (273/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

21.4 Functional Operating Range
Characteristic
Operating Temperature Range
Operating Voltage Range
Symbol
T_A
V_DD
Electrical Specifications
Functional Operating Range
Value
Unit
0 to 85
°C
4.5 to 5.5
V
21.5 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal Resistance
QFP (44 Pins)
SDIP (42 Pins)
PDIP (28 Pins)
θ_JA
95
60
°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 × (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
NOTES:
1. Power dissipation is a function of temperature.
2. K is a 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.
MC68HC908BD48 — Rev. 1.0
MOTOROLA
Electrical Specifications
Technical Data
273