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MAX6821_05

更新时间： 2024-11-19 11:47:39
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美信 - MAXIM /
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9页 356K
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Low-Voltage SOT23 uP Supervisors with Manual Reset and Watchdog Timer

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MAX6821_05 数据手册

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19-1868; Rev 2; 12/05  
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  
o Guaranteed Reset Valid to V  
o Immune to Short Negative V  
o No External Components  
= +1.0V  
Transients  
CC  
teed to be in the correct state for V  
down to +1.0V.  
CC  
CC  
Nine preprogrammed reset threshold voltages are  
available (see the 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.  
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  
Devices are available in both leaded and lead-free packaging.  
Specify lead-free by replacing “-T” with “+T” when ordering.  
Set-Top Boxes  
Automotive Systems  
Critical µP Monitoring  
Computers and  
Controllers  
Portable/Battery-  
Embedded Controllers  
Intelligent Instruments  
Powered Equipment  
Threshold Suffix Guide  
RESET  
THRESHOLD (V)  
SUFFIX  
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
V
CC  
S
R
Z
MAX6821  
MAX6822  
MAX6823  
GND  
MR  
Y
4
WDI  
W
V
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 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...9

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