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參數(shù)資料
| 型號： | LM3722 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 復位半導體 |
| 英文描述： | 5-Pin Microprocessor Reset Circuits |
| 中文描述： | 5引腳微處理器復位電路 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 219K |
| 代理商： | LM3722 |
LM3722/LM3723/LM3724
5-Pin Microprocessor Reset Circuits
General Description
The LM3722/LM3723/LM3724 microprocessor supervisory
circuits monitor the power supplies in microprocessor and
digital systems. They provide a reset to the microprocessor
during power-up, power-down, brown-out conditions, and
manual reset.
The LM3722/LM3723/LM3724 asserts a reset signal when-
ever the supply decreases below the factory-programmed
reset threshold for at least 100 ms. The reset signal remains
asserted for 190 ms after V
CC
rises above the threshold.
The LM3722 has an active-low RESET push-pull output. The
LM3723 has an active-high RESET push-pull output. The
LM3724 has an active-low open-drain RESET output.
Three standard reset voltage options are available, suitable
for monitoring 5V, 3.3V, and 2.5V supply voltages. Additional
reset voltages are also available; contact National Semicon-
ductor for details.
With
a
low
supply
current
of
LM3722/LM3723/LM3724 are ideal for use in portable equip-
ment. The LM3722/LM3723/LM3724 are available in the
5-pin SOT23 package.
only
6μA,
the
Features
n
Precise monitoring of 2.5V, 3.3V, and 5V supply
voltages
n
Fully specified over temperature
Industrial: 40C to +85C
Extended: 40C to +125C
n
100 ms minimum Power-On Reset pulse width, 190 ms
typical:
Active-Low RESET Output (LM3722)
Active-High RESET Output (LM3723)
Active-Low RESET Open Drain Output (LM3724)
n
Guaranteed RESET Output valid for V
CC
≥
1V
n
Low Supply Current, 6μA typical
n
Power supply transient immunity
n
Compatible with MAX811/812 applications
Applications
n
Microprocessor Systems
n
Computers
n
Controllers
n
Intelligent Instruments
n
Portable/Battery-Powered Equipment
Typical Application Circuit
20014401
20014437
Connection Diagram
SOT23-5
20014402
*
( ) are for LM3723
June 2001
L
2001 National Semiconductor Corporation
DS200144
www.national.com
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