參數(shù)資料
型號: MC68HCL05P1ADW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 122/124頁
文件大?。?/td> 3724K
代理商: MC68HCL05P1ADW
Electrical Specifications
Thermal Characteristics
MC68HC05P1A Rev. 3.0
General Release Specification
Electrical Specifications
NON-DISCLOSURE
AGREEMENT
REQUIRED
10.5 Thermal Characteristics
10.6 Power Considerations
The average chip-junction temperature, TJ, can be obtained in °C from:
TJ = TA + (PD ×θJA)
(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.
The following is an approximate relationship between PD and TJ
(neglecting PI/O):
PD = K + (TJ + 273 °C)
(2)
Solving equations (1) and (2) for K gives:
K = PD × (TA + 273 °C) + θJA × (PD)
2
(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.
Characteristic
Symbol
Value
Unit
Thermal Resistance
PDIP
SOIC
θ
JA
56
71
°C/W
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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