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SPMCK16Z4MPV20 Datasheet(PDF) 289 Page - Freescale Semiconductor, Inc

Part # SPMCK16Z4MPV20
Description  M68HC16Z Series
PDF  500 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

SPMCK16Z4MPV20 Datasheet(HTML) 289 Page - Freescale Semiconductor, Inc

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M68HC16 Z SERIES
ELECTRICAL CHARACTERISTICS
USER’S MANUAL
A-5
Table A-6 Thermal Characteristics
Num
Characteristic
Symbol
Value
Unit
1
Thermal Resistance
Plastic 132-Pin Surface Mount
Plastic 144-Pin Surface Mount
Θ
JA
38
49
°C/W
The average chip-junction temperature (TJ) in C can be obtained from:
(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:
(2)
Solving equations 1 and 2 for K gives:
(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 equations (1) and (2) iteratively for any value of TA.
T
J
T
A
P
D
Θ
JA
×
()
+
=
P
D
KT
J
273
°C
+
()
÷
=
KP
D
T
A
273
°C
+
()
×Θ
JA
P
D
2
×
+
=
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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