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MAX821

更新时间： 2024-09-29 14:57:23
品牌 Logo 应用领域
亚德诺 - ADI 微处理器
页数 文件大小 规格书
7页 179K
描述
4引脚、微处理器电压监测器，引脚可设置上电复位超时周期

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MAX821 数据手册

 浏览型号MAX821的Datasheet PDF文件第2页浏览型号MAX821的Datasheet PDF文件第3页浏览型号MAX821的Datasheet PDF文件第4页浏览型号MAX821的Datasheet PDF文件第5页浏览型号MAX821的Datasheet PDF文件第6页浏览型号MAX821的Datasheet PDF文件第7页 
19-1122; Rev 3; 12/05  
4-Pin µP Voltage Monitors with Pin-Selectable  
Power-On Reset Timeout Delay  
General Description  
Features  
♦ Pin-Selectable, Precision Power-On Reset Delay:  
The MAX821/MAX822 microprocessor (µP) supervisory  
circuits monitor power supplies in µP and digital sys-  
tems. They provide excellent circuit reliability and low  
cost by eliminating external components and adjust-  
ments when used with 5V-powered or 3V-powered cir-  
cuits. The MAX821/MAX822 also provide a power-on  
reset timeout delay that is pin selectable to 1ms (max),  
20ms (min), or 100ms (min).  
1ms (max), 20ms (min), or 100ms (min)  
♦ Precision Monitoring of +3V to +5V Power-Supply  
Voltages  
♦ 2.5µA Supply Current  
♦ Guaranteed Over Temperature (-40°C to +125°C)  
♦ Guaranteed RESET Valid to V  
= 1V (MAX821)  
CC  
These devices perform a single function: they assert a  
reset signal whenever the V  
supply voltage falls  
CC  
♦ Power-Supply Transient Immunity  
♦ No External Components  
♦ SOT143 Package  
below a preset threshold, and they keep reset asserted  
for the pin-selected reset timeout delay after V has  
CC  
risen above the reset threshold. The only difference  
between the two devices is that the MAX821 has an  
active-low RESET output (which is guaranteed to be in  
Ordering Information  
the correct state for V  
down to 1V), while the  
CC  
PART  
NOMINAL V (V)  
TH  
TOP MARK*  
AZ_ _  
MAX822 has an active-high RESET output. The reset  
comparator is designed to ignore fast transients on  
MAX821LUS-T  
MAX821MUS-T  
MAX821PUS-T  
MAX821TUS-T  
MAX821SUS-T  
MAX821UUS-T  
MAX821RUS-T  
MAX822LUS-T  
MAX822MUS-T  
MAX822TUS-T  
MAX822SUS-T  
MAX822RUS-T  
4.63  
4.38  
4.00  
3.08  
2.93  
2.78  
2.63  
4.63  
4.38  
3.08  
2.93  
2.63  
V
. Reset thresholds suitable for operation with a vari-  
CC  
BA_ _  
BM_ _  
BB_ _  
BC_ _  
BL_ _  
ety of supply voltages are available.  
Low supply current makes the MAX821/MAX822 ideal  
for use in portable equipment. These devices come in a  
4-pin SOT143 package.  
BD_ _  
BF_ _  
________________________Applications  
Bar-Code Scanners  
BG_ _  
BH_ _  
BJ_ _  
Computers  
Controllers  
BK_ _  
Intelligent Instruments  
Critical µP and µC Power Monitoring  
Portable/Battery-Powered Equipment  
* The first two letters in the package top mark identify the part,  
while the remaining two letters are the lot-tracking code.  
Devices are available in both leaded and lead-free packaging.  
Specify lead-free by replacing “-T” with “+T” when ordering.  
__________Typical Operating Circuit  
Pin Configuration  
V
CC  
V
CC  
TOP VIEW  
1
2
4
V
CC  
GND  
µP  
MAX821  
MAX822  
MAX821  
MAX822  
RESET  
INPUT  
RESET  
(RESET)  
20ms  
100ms  
1ms  
SRT  
SRT  
3
(RESET) RESET  
GND  
GND  
SOT143  
( ) ARE FOR MAX822  
( ) ARE FOR MAX822  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567

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