MC68HC908GR8A_07 Datasheet, PDF (232/260 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
19.3 Functional Operating Range
Characteristic
Operating temperature range
Operating voltage range
Symbol
Value
Unit
T_A
V_DD
–40 to +125
°C
3.0 ±10%
5.0 ±10%
V
19.4 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal resistance
PDIP (28-pin)
SOIC (28-pin)
QFP (32-pin)
θ_JA
60
60
°C/W
95
I/O pin power dissipation
Power dissipation⁽¹⁾
Constant⁽²⁾
Average junction temperature
Maximum junction temperature
P_I/O
User-Determined
W
P_D
P_D = (I_DD × V_DD) + P_I/O =
K/(T_J + 273 °C)
W
K
P_D
x
+
P(T_DA²⁺ײθ⁷_J³_A
°C)
W/°C
T_J
T_A + (P_D × θ_JA)
°C
T_JM
140
°C
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.
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
232
Freescale Semiconductor