參數(shù)資料
型號(hào): MCF5207
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microprocessor Data Sheet
中文描述: 微處理器數(shù)據(jù)表
文件頁數(shù): 20/46頁
文件大小: 936K
代理商: MCF5207
MCF5208 ColdFire
Microprocessor Data Sheet, Rev. 0.5
Preliminary
Preliminary Electrical Characteristics
Freescale Semiconductor
20
The average chip-junction temperature (T
J
) in
°
C can be obtained from:
Eqn. 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
×
IV
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 ignored. An approximate relationship between P
D
and T
J
(if
P
I/O
is neglected) is:
Eqn. 2
Solving equations 1 and 2 for K gives:
Eqn. 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
Equation 1
and
Equation 2
iteratively for any value of T
A
.
5.3
ESD Protection
NOTES:
1
θ
JMA
and
Ψ
jt
parameters are simulated in conformance with EIA/JESD Standard 51-2 for natural convection.
Freescale recommends the use of
θ
JmA
and power dissipation specifications in the system design to prevent
device junction temperatures from exceeding the rated specification. System designers should be aware that
device junction temperatures can be significantly influenced by board layout and surrounding devices.
Conformance to the device junction temperature specification can be verified by physical measurement in the
customer’s system using the
Ψ
jt
parameter, the device power dissipation, and the method described in
EIA/JESD Standard 51-2.
2
Per JEDEC JESD51-6 with the board horizontal.
3
Thermal resistance between the die and the printed circuit board in conformance with JEDEC JESD51-8. Board
temperature is measured on the top surface of the board near the package.
4
Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL
SPEC-883 Method 1012.1).
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 in conformance with Psi-JT.
Table 6. ESD Protection Characteristics
1,
2
Characteristics
Symbol
Value
Units
ESD Target for Human Body Model
HBM
2000
V
T
J
T
A
P
D
Θ
JMA
×
(
)
+
=
P
D
273
°
C
T
J
+
)
-------------K
=
K
P
D
T
A
273
°
C
×
(
)
Q
JMA
P
D
2
×
+
×
=
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