Electrical Specifications
19.3 Functional Operating Range
Characteristic
Symbol
Value
Unit
°C
Operating temperature range(1)
MC68HC908MR24CFU
TA
–40 to 85
–40 to 105
MC68HC908MR24VFU
VDD
Operating voltage range
5.0 ± 10%
V
1. See Motorola representative for temperature availability.
C = Extended temperature range (–40°C to +85°C)
V = Automotive temperature range (–40°C to +105°C)
19.4 Thermal Characteristics
Characteristic
Thermal resistance,
Symbol
Value
Unit
°C/W
W
θJA
76
64-pin QFP
PI/O
PD
I/O pin power dissipation
User determined
PD = (IDD x VDD) + PI/O
=
Power dissipation(1)
Constant(2)
W
K/(TJ + 273°C)
PD x (TA + 273°C)
+ PD2 x θJA
K
W/°C
TJ
TA + (PD x θJA)
Average junction temperature
Maximum junction temperature
°C
°C
TJM
125
1. Power dissipation is a function of temperature.
2. K is a constant unique to the device. K can be determined for a known TA and measured PD.
With this value of K, PD and TJ can be determined for any value of TA.
Data Sheet
290
MC68HC908MR32 • MC68HC908MR16 — Rev. 6.0
Electrical Specifications
MOTOROLA
FREESCALE [ Freescale ]
