MC68HC908AS32A Datasheet, PDF (260/280 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
19.3 Functional Operating Range
Rating
Operating temperature range
Part suffix MFN
Part suffix VFN
Part suffix CFN
Operating voltage range
Symbol
Value
Unit
T_A
–40 to 125
–40 to 105
°C
–40 to 85
V_DD
5.0 ± 0.5
V
NOTE
For applications which use the LVI, Freescale guarantee the functionality of
the device CPU only down to the LVI trip point (V_LVI) within the constraints
outlined in Chapter 11 Low-Voltage Inhibit (LVI).
19.4 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal resistance
QFP (64 pins)
θ_JA
70
°C/W
Thermal resistance
PLCC (52 pins)
θ_JA
50
°C/W
I/O pin power dissipation
Power dissipation⁽¹⁾
Constant⁽²⁾
Average junction temperature
P_I/O
User Determined
W
P_D
P_D = (I_DD x V_DD) + P_I/O =
K/(T_J + 273 °C)
W
K
P_D x (T_A + 273 °C)
+ (P_D2 x θ_JA)
W/°C
T_J
T_A + P_D x θ_JA
°C
1. Power dissipation is a function of temperature.
2. K is a constant unique to the device. K can be determined from 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.
MC68HC908AS32A Data Sheet, Rev. 2.0
260
Freescale Semiconductor