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參數資料
| 型號： | LM3709YTBP-308 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA9 |
| 封裝： | MICRO, SMD-9 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 200K |
| 代理商： | LM3709YTBP-308 |
LM3708/LM3709
Microprocessor Supervisory Circuits with Low Line
Output, Manual Reset and Watchdog Timer
General Description
The LM3708/LM3709 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3708/LM3709 series are available
in a 9-bump micro SMD 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 pulled
low.
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
n
Standard Reset Threshold voltage: 3.08V
n
Custom Reset Threshold voltages: For other voltages
between 2.2V and 5.0V in 10mV increments, contact
National Semiconductor Corp.
n
No external components required
n
Manual-Reset input
n
RESET (LM3708) or RESET (LM3709) outputs
n
Precision supply voltage monitor
n
Factory programmable Reset and Watchdog Timeout
Delays
n
Available in micro SMD package for minimum footprint
n ±
0.5% Reset threshold accuracy at room temperature
n ±
2% Reset threshold accuracy over temperature
extremes
n
Reset assertion down to 1V V
CC (RESET option only)
n
28 A V
CC supply current
Applications
n
Embedded Controllers and Processors
n
Intelligent Instruments
n
Automotive Systems
n
Critical P Power Monitoring
Typical Application
DS200117-3
November 2000
LM3708/LM3709
Microprocessor
Supervisory
Circuits
with
Low
Line
Output,
Manual
Reset
and
W
atchdog
T
imer
2000 National Semiconductor Corporation
DS200117
www.national.com
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