MC68HC908QC16_07 Datasheet, PDF (236/274 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
19.3 Functional Operating Range
Characteristic
Operating temperature range
Operating voltage range
Maximum junction temperature
Symbol
T_A
V_DD
T_MAX
Value
– 40 to +125
– 40 to +105
– 40 to +85
3.0 to 5.5
135
Unit
Temp.
Code
M
°C
V
C
V
—
°C
—
19.4 Thermal Characteristics
This section provides information about operating temperature range, power dissipation, and package
thermal resistance. Power dissipation on I/O pins is usually small compared to the power dissipation in
on-chip logic and voltage regulator circuits, and it is user-determined rather than being controlled by the
MCU design. To take P_I/O into account in power calculations, determine the difference between actual pin
voltage and V_SS or V_DD and multiply by the pin current for each I/O pin. Except in cases of unusually high
pin current (heavy loads), the difference between pin voltage and V_SS or V_DD will be very small.
Table 19-1. Thermal Characteristics
Rating
Symbol
Thermal resistance
Single-layer board (1 signal plane)
28-pin SOIC
28-pin TSSOP
20-pin SOIC
θ_JA
20-pin TSSOP
16-pin SOIC
16-pin TSSOP
Thermal resistance
Four-layer board (2 signal planes, 2 power planes)
28-pin SOIC
28-pin TSSOP
20-pin SOIC
θ_JA
20-pin TSSOP
16-pin SOIC
16-pin TSSOP
Value
68
94
75
109
84
123
45
61
46
68
50
77
Unit
°C/W
°C/W
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 3
236
Freescale Semiconductor