MC68HC711D3_05 Datasheet, PDF (106/138 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Characteristics
9.3 Functional Operating Temperature Range
Rating
Operating temperature range
MC68HC711D3
MC68HC711D3V
Symbol
Value
Unit
T_L to T_H
T_A
–40 to +85
°C
–40 to +105
9.4 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Average junction temperature
T_J
T_A + (P_D × Θ_JA)
°C
Ambient temperature
T_A
User-determined
°C
Package thermal resistance (junction-to-ambient)
40-pin plastic dual in-line package (DIP)
44-pin plastic leaded chip carrier (PLCC)
44-pin plastic quad flat pack (QFP)
Θ_JA
50
50
°C/W
85
Total power dissipation⁽¹⁾
P_D
P_INT + P_I/O
K / T_J + 273°C
W
Device internal power dissipation
P_INT
I_DD × V_DD
W
I/O pin power dissipation⁽²⁾
P_I/O
User-determined
W
A constant⁽³⁾
K
P_D × (T_A + 273°C)
+ Θ_JA × P_D2
W/°C
1. This is an approximate value, neglecting P_I/O.
2. For most applications, P_I/O ≤ P_INT and can be neglected.
3. K is a constant pertaining to the device. Solve for K with a known T_A and a measured P_D (at equilibrium). Use this value
of K to solve for P_D and T_J, iteratively, for any value of T_A.
MC68HC711D3 Data Sheet, Rev. 2.1
106
Freescale Semiconductor