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| 型號： | MC68HC2681P |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 51/88頁 |
| 文件大小： | 726K |
| 代理商： | MC68HC2681P |
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MOTOROLA
MC68HC681 USER’S MANUAL
5-1
5
SECTION 5
ELECTRICAL SPECIFICATIONS
5.1 ABSOLUTE MAXIMUM RATINGS
5.2 THERMAL CHARACTERISTICS
5.3 POWER CONSIDERATIONS
The average chip-junction temperature, TJ, in °C can be obtained from:
TJ = TA + (PDθJA)
(1)
Where:
TA = Ambient Temperature, °C
θ
JA = Package Thermal Resistance, Junction-to-Ambient, °C/W
PD = PINT + PI/O
PINT = ICC x VCC, 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)
(2)
Solving equations 1 and 2 for K gives:
K = PD(TA + 273°C) + θJAPD
2
(3)
RATING
SYMBOL
VALUE
UNIT
This device contains circuitry to protect
the inputs against damage due to high
static voltages or electric fields; however,
it is advised that normal precautions be
taken to avoid application of any voltage
higher than maximum-rated voltages to
this high-impedance circuit. Reliability of
operation is enhanced if unused inputs
are tied to an appropriate logic voltage
level (e.g., either GND or VCC).
Supply Voltage
VCC
-0.5 to + 6.0
V
Input Voltage
Vin
-0.5 to + 6.0
V
Operating Temperature Range
TA
0 to + 70
°C
Storage Temperature
Tstg
-65 to + 150
°C
CHARACTERISTIC
SYMBOL
VALUE
SYMBOL
VALUE
RATING
Thermal Resistance (Still Air)
Plastic,
Type FN
Type P
θ
JA
45
50
θ
JC
22
25
°C/W
NOTE: Estimate
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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