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ASM161JCUS/T PDF预览

ASM161JCUS/T

更新时间： 2024-11-26 22:17:07
品牌 Logo 应用领域
ALSC 电源电路电源管理电路光电二极管监控
页数 文件大小 规格书
9页 246K
描述
uP Supervisory Circuit

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ASM161JCUS/T 数据手册

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October 2003  
ASM161 / ASM162  
rev 1.0  
µP Supervisory Circuit  
Key Features  
General Description  
The ASM161 and ASM162 are cost effective, low power  
supervisory circuits that monitor power supplies in  
microprocessor, microcontroller and digital systems. If the  
power supply drops below the reset threshold level, a reset is  
asserted and remains asserted for atleast 800ms after VCC has  
•
•
•
•
•
•
Edge triggered manual reset input  
single pulse output  
49µS minimum MR disable period after reset  
CMOS/TTL logic or switch interface  
Debounced input  
Low supply current extends battery life  
•
•
6µA / 15µA typ/max at 5.5V  
4.5µA / 10µA typ/max at 3.6V  
risen above the reset threshold. An improved manual reset  
architecture gives the system designer additional flexibility.  
•
•
Long reset period  
• 0.8 sec minimum, 2 sec maximum  
Two reset polarity options  
The debounced manual reset input is negative edge triggered.  
The reset pulse period generated by a MR transition is a  
minimum of 800 ms and a maximum of 2 sec duration. In  
addition, The MR input signal is blocked for an additional 49µS  
minimum after the reset pulse ends. During the MR disable  
period, the microcontroller is guaranteed a time period free of  
additional manual reset signals. During this period DRAM  
contents can be refreshed or other critical system tasks  
undertaken. Low power consumption makes the ASM161/162  
ideal for use in portable and battery operated equipments. With  
3V supplies power consumption is 8µW typically and 30µW  
maximum. The ASM161 has an open-drain, active-LOW  
RESET output and requires an external pull-up resistor. The  
ASM162 has an active HIGH RESET output.  
• ASM161: Active LOW, open-drain  
• ASM162: Active HIGH  
Pinout matches the AS811/812  
Small 4-Pin SOT-143 package  
•
•
•
Two temperature ranges: 00 to 700c and -400c to +850c  
Applications  
•
•
•
•
•
•
•
PDAs  
Appliances  
Computers and embedded controllers  
Wireless communication systems  
Battery operated and intelligent instruments  
Automotive systems  
Safety systems  
Typical Operating Circuit  
The ASM161/162 are offered in compact 4-pin SOT-143  
packages. No external components are required to trim  
threshold voltage for monitoring different supply voltages. With  
six different factory set, reset, threshold ranges from 2.63V to  
4.63V, the ASM161/162 are suitable for monitoring 5V, 3.6V  
and 3.0V supplies. The ASM161/162 are available in  
VCC  
VCC  
VCC  
temperature ranges 00 to 700c and -400c to +850c.  
20k for  
ASM161  
only  
ASM161  
(ASM162)  
RESET  
(RESET)  
RESET  
(RESET)  
Reset Threshold  
Part Suffix  
Voltage (V)  
4.63  
µP  
MR  
L
M
J
GND  
GND  
4.38  
4.00  
T
S
R
3.08  
2.93  
2.63  
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  
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