MCF5282UM Datasheet, PDF (687/766 Pages) Freescale Semiconductor, Inc – MCF5282 and MCF5216 ColdFire Microcontroller User s Manual

Electrical Characteristics
5 _{Thermal characterization parameter indicating the temperature difference between package top and the junction}
temperature per JEDEC JESD51-2. When Greek letters are not available, the thermal characterization parameter is
written as Psi-JT.
The average chip-junction temperature (T_J) in °C can be obtained from:
T_J = T_A + (P_D × Θ_JMA) (1)
Where:
T_A
= Ambient Temperature, ×C
Q_JMA = Package Thermal Resistance, Junction-to-Ambient, ×C/W
P_D
= P_INT + P_I/O
P_INT = I_DD × V_DD, Watts - Chip Internal Power
P_I/O
= Power Dissipation on Input and Output Pins — User Determined
For most applications P_I/O < P_INT and can be neglected. An approximate relationship
between P_D and T_J (if P_I/O is neglected) is:
P_D = K ÷ (T_J + 273°C) (2)
Solving equations 1 and 2 for K gives:
K = P_D × (T_A + 273 × C) + Q_JMA × P_D ² (3)
where K is a constant pertaining to the particular part. K can be determined from equation
(3) by measuring P_D (at equilibrium) for a known T_A. Using this value of K, the values of
P_D and T_J can be obtained by solving equations (1) and (2) iteratively for any value of T_A.
33.3
DC Electrical Specifications
Table 33-3. DC Electrical Specifications¹
(V_SS = V_SSPLL= V_SSF = V_SSA= 0 V_DC)
Characteristic
Symbol Min
Max Unit
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Leakage Current
V_in = V_DD or V_SS, Input-only pins
High Impedance (Off-State) Leakage Current
V_in = V_DD or V_SS, All input/output and output pins
Output High Voltage (All input/output and all output pins)
I_OH = –5.0 mA
Output Low Voltage (All input/output and all output pins)
I_OL = 5.0mA
Weak Internal Pull Up Device Current, tested at V_IL Max.
Input Capacitance ²
All input-only pins
All input/output (three-state) pins
V_IH
V_IL
V_HYS
I_in
0.7 x V_DD 5.25
V
V_SS – 0.3 0.35 x V_DD V
0.06 x
—
mV
V_DD
-1.0
1.0
μA
I_OZ
-1.0
1.0
μA
V_OH V_DD - 0.5
__
V
V_OL
__
0.5
V
I_APU
-10
-130
μA
C_in
—
—
pF
7
7
Freescale Semiconductor
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
33-3