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MAX6822VUK+

更新时间： 2024-11-26 13:11:03
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美信 - MAXIM 微处理器监控
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19-1868; Rev 1; 1/01  
Low-Voltage SOT23 µP Supervisors with  
Manual Reset and Watchdog Timer  
General Description  
Features  
The MAX6821–MAX6825 are low-voltage microprocessor  
(µP) supervisory circuits that combine voltage monitor-  
ing, watchdog timer, and manual reset input functions in  
a 5-pin SOT23 package. Microprocessor supervisory cir-  
cuits significantly improve system reliability and accura-  
cy compared to separate ICs or discrete components.  
These devices assert a reset signal whenever the moni-  
tored voltage drops below its preset threshold, keeping it  
o Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V  
Supplies  
o 140ms (min) Reset Timeout Delay  
o 1.6s Watchdog Timeout Period  
(MAX6821/MAX6822/MAX6823/MAX6824)  
o Manual Reset Input  
(MAX6821/MAX6822/MAX6823/MAX6825)  
o Three Reset Output Options  
asserted for a minimum timeout period after V  
rises  
CC  
above the threshold. In addition, a watchdog timer moni-  
tors against code execution errors. A debounced manual  
reset is also available. The MAX6821–MAX6825 monitor  
voltages from +1.8V to +5.0V. These outputs are guaran-  
Push-Pull RESET  
Push-Pull RESET  
Open-Drain RESET  
teed to be in the correct state for V  
down to +1.0V.  
CC  
o Guaranteed Reset Valid to V  
o Immune to Short Negative V  
o No External Components  
= +1.0V  
CC  
Nine preprogrammed reset threshold voltages are  
available (see Threshold Suffix Guide). The MAX6821,  
MAX6822, and MAX6823 all have a manual reset input  
and a watchdog timer. The MAX6821 has push-pull  
RESET, the MAX6822 has open-drain RESET, and the  
MAX6823 has push-pull RESET. The MAX6824 has a  
watchdog timer and both push-pull RESET and push-  
pull RESET. The MAX6825 has a manual reset input  
and both push-pull RESET and push-pull RESET. The  
Selector Guide explains the functions offered in this  
series of parts.  
Transients  
CC  
o Small 5-Pin SOT23 Packages  
Ordering Information  
*
PART  
TEMP. RANGE  
-40°C to +125°C  
-40°C to +125°C  
-40°C to +125°C  
-40°C to +125°C  
-40°C to +125°C  
PIN-PACKAGE  
5 SOT23-5  
5 SOT23-5  
5 SOT23-5  
5 SOT23-5  
5 SOT23-5  
MAX6821_UK-T  
MAX6822_UK-T  
MAX6823_UK-T  
MAX6824_UK-T  
MAX6825_UK-T  
________________________Applications  
*Insert the desired suffix letter (from the table below) into the blank  
to complete the part number.  
Set-Top Boxes  
Automotive Systems  
Critical µP Monitoring  
Computers and  
Controllers  
Portable/Battery-  
Powered Equipment  
Threshold Suffix Guide  
Embedded Controllers  
Intelligent Instruments  
RESET  
SUFFIX  
THRESHOLD (V)  
Pin Configurations  
L
M
T
4.63  
4.38  
3.08  
2.93  
2.63  
2.32  
2.19  
1.67  
1.58  
TOP VIEW  
RESET(RESET)  
1
2
3
5
4
V
CC  
S
R
Z
MAX6821  
MAX6822  
MAX6823  
GND  
MR  
Y
W
V
WDI  
SOT23-5  
Note: Bold indicates standard versions. Samples are typically  
available for standard versions only. All parts require a 2.5k  
minimum order increment. Contact factory for availability.  
(RESET) MAX6821 ONLY  
Pin Configurations continued at end of data sheet.  
Typical Operating Circuit appears at end of data sheet.  
Selector Guide appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
1234567...9

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