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參數資料
| 型號： | LM8805TLX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PBGA9 |
| 封裝： | MICRO, SMD-9 |
| 文件頁數： | 1/14頁 |
| 文件大?。?/td> | 312K |
| 代理商： | LM8805TLX/NOPB |
LM8805
March 14, 2011
Microprocessor Supervisory Circuits with Power Fail
Input, Low Line Output, Manual Reset and Watchdog Timer
General Description
The LM8805 microprocessor supervisory circuit provides the
maximum flexibility for monitoring power supplies and battery
controlled functions in systems without backup batteries. The
LM8805 is available in a 9-bump microSMD package.
Built-in features include the following:
Reset: Reset is asserted during power-up, power-down, and
brownout conditions. RESET is guaranteed down to V
CC of
1.0V.
Manual Reset Input: An input that asserts reset when taken
high.
Power-Fail Input: A 1.225V threshold detector for power fail
warning, or to monitor a power supply other than V
CC.
Low Line Output: This early power failure warning indicator
goes low when the supply voltage drops to a value which is
2% higher than the reset threshold voltage.
Watchdog Timer: The WDI (Watchdog Input) monitors one of
the P's output lines for activity. If no output transition occurs
during the watchdog timeout period, reset is activated.
Features
■ Standard Reset Threshold voltages:
— Rising 2.6V
— Falling 2.3V
■ No external components required
■ Manual-Reset input
■ RESET output
■ Precision supply voltage monitor
■ Separate Power Fail comparator
■ ±0.5% Reset threshold accuracy at room temperature
■ ±2% Reset threshold accuracy over temperature
extremes
■ Reset assertion down to 1V V
CC (RESET option only)
■ 28 A V
CC supply current
■ Available in large bump micro-SMD package
Applications
■ Embedded Controllers and Processors
■ Intelligent Instruments
■ Automotive Systems
■ Critical P Power Monitoring
Typical Application
30123603
2011 National Semiconductor Corporation
301236
www.national.com
LM8805
Microprocessor
Supervisory
Circuits
with
Power
Fail
Input,
Low
Line
Output,
Manual
Reset
and
Watchdog
Timer
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