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ASM812MEUSF

更新时间： 2024-11-27 12:34:51
品牌 Logo 应用领域
安森美 - ONSEMI 光电二极管监控输入元件
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11页 439K
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4-Pin muP Voltage Supervisor with Manual Reset

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ASM812MEUSF 数据手册

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ASM811, ASM812  
April 2005  
rev 1.5  
4-Pin µP Voltage Supervisor with Manual Reset  
Six voltage thresholds are available to support 3V to 5V  
systems:  
General Description  
The ASM811/ASM812 are cost effective low power supervisors  
designed to monitor voltage levels of 3.0V, 3.3V and 5.0V  
power supplies in low-power microprocessor (µP),  
microcontroller (µC) and digital systems. They provide excellent  
reliability by eliminating external components and adjustments.  
RESET THRESHOLD  
Suffix  
Voltage (V)  
4.63  
L
M
J
4.38  
4.00  
A reset signal is issued if the power supply voltage drops below  
a preset reset threshold and is asserted for at least 140ms after  
the supply has risen above the reset threshold. The ASM811  
has an active-low output RESET that is guaranteed to be in the  
correct state for VCC down to 1.1V. The ASM812 has an active-  
T
S
R
3.08  
2.93  
2.63  
high RESET output. The reset comparator is designed to ignore  
fast transients on VCC. A debounced manual reset input allows  
Features  
•
•
•
•
•
•
•
•
•
•
New 4.0V threshold option  
the user to manually reset the systems to bring them out of  
locked state.  
6µA supply current  
Monitor 5V, 3.3V and 3V supplies  
Manual reset input  
Low power consumption makes the ASM811/ASM812 ideal for  
use in portable and battery operated equipment. The ASM811/  
ASM812 are available in a compact 4-pin SOT-143 package  
and thus use minimal board space.  
140ms min. reset pulse width  
Guaranteed over temperature  
Active-low reset valid with 1.1V supply (ASM811)  
Small 4-pin SOT-143 package  
No external components  
Power-supply transient-immune design  
Applications  
Typical Operating Circuit  
•
•
•
•
•
•
•
•
Computers and Controllers  
Embedded controllers  
Portable/Battery operated systems  
Intelligent instruments  
VCC  
Wireless communication systems  
PDAs and handheld equipments  
Automotive systems  
VCC  
ASM811  
(ASM812)  
VCC  
µP  
Safety Systems  
RESET  
Input  
(RESET)  
RESET  
MR  
(RESET)  
GND  
GND  
Alliance Semiconductor  
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com  
Notice: The information in this document is subject to change without notice  
1234567...11

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