MC908QY8CDWE Datasheet, PDF (210/232 Pages) Freescale Semiconductor, Inc – Addendum to MC68HC908QB8, rev. 3

Electrical Specifications
18.3 Functional Operating Range
Characteristic
Operating temperature range
Operating voltage range
Symbol
T_A
(T_L to T_H)
V_DD
Value
– 40 to +125
– 40 to +105
– 40 to +85
2.7 to 5.5
Unit
Temperature
Code
M
°C
V
C
V
—
18.4 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal resistance
16-pin PDIP
16-pin SOIC
16-pin TSSOP
θ_JA
76
90
°C/W
133
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 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
T_JM
150
°C
1. Power dissipation is a function of temperature.
2. K 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.
MC68HC908QB8 Data Sheet, Rev. 3
208
Freescale Semiconductor