MC68HC908GR8 Datasheet, PDF (248/286 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Electrical Specifications
23.2 Functional Operating Range
Characteristic
Operating temperature range
Operating voltage range
Symbol
T_A
V_DD
Value
Unit
–40 to +125
°C
3.0 ±10%
5.0 ±10%
V
NOTE
To ensure correct operation of the MCU under all operating conditions, the
user must write data $1C to address $0033 immediately after reset. This is
to ensure proper termination of an unused module within the MCU.
23.3 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal resistance
PDIP (28-pin)
SOIC (28-pin)
QFP (32-pin)
SDIP (42-pin)
60
θ_JA
60
°C/W
95
57
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
P_D x (T_A + 273 °C)
K
+ P_D² × θ_JA
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.
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
248
Freescale Semiconductor