參數(shù)資料
型號: MCF51QE128CLK
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 50.33 MHz, MICROCONTROLLER, PQFP80
封裝: 14 X 14 MM, ROHS COMPLIANT, LQFP-80
文件頁數(shù): 3/38頁
文件大?。?/td> 978K
代理商: MCF51QE128CLK
Electrical Characteristics
MCF51QE128 Series Data Sheet, Rev. 7
Freescale Semiconductor
11
The average chip-junction temperature (TJ) in °C can be obtained from:
TJ = TA + (PD × θJA)
Eqn. 1
where:
TA = Ambient temperature, °C
θ
JA = Package thermal resistance, junction-to-ambient, °C/W
PD = Pint + PI/O
Pint = IDD × VDD, Watts — chip internal power
PI/O = Power dissipation on input and output pins — user determined
For most applications, PI/O << Pint and can be neglected. An approximate relationship between PD and TJ (if PI/O is neglected)
is:
PD = K ÷ (TJ + 273°C)
Eqn. 2
Solving Equation 1 and Equation 2 for K gives:
K = PD × (TA + 273°C) + θJA × (PD)
2
Eqn. 3
where K is a constant pertaining to the particular part. K can be determined from equation 3 by measuring PD (at equilibrium)
for a known TA. Using this value of K, the values of PD and TJ can be obtained by solving Equation 1 and Equation 2 iteratively
for any value of TA.
3.5
ESD Protection and Latch-Up Immunity
Although damage from electrostatic discharge (ESD) is much less common on these devices than on early CMOS circuits,
normal handling precautions should be used to avoid exposure to static discharge. Qualification tests are performed to ensure
that these devices can withstand exposure to reasonable levels of static without suffering any permanent damage.
All ESD testing is in conformity with AEC-Q100 Stress Test Qualification for Automotive Grade Integrated Circuits. During
the device qualification ESD stresses were performed for the human body model (HBM), the machine model (MM) and the
charge device model (CDM).
A device is defined as a failure if after exposure to ESD pulses the device no longer meets the device specification. Complete
DC parametric and functional testing is performed per the applicable device specification at room temperature followed by hot
temperature, unless specified otherwise in the device specification.
Table 6. ESD and Latch-up Test Conditions
Model
Description
Symbol
Value
Unit
Human
Body
Series resistance
R1
1500
Ω
Storage capacitance
C
100
pF
Number of pulses per pin
3
Machine
Series resistance
R1
0
Ω
Storage capacitance
C
200
pF
Number of pulses per pin
3
Latch-up
Minimum input voltage limit
– 2.5
V
Maximum input voltage limit
7.5
V
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