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MAX825T

更新时间: 2024-11-11 12:18:55
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美信 - MAXIM 微处理器监控
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10页 213K
描述
5-Pin Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset

MAX825T 数据手册

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19-0487; Rev 5; 12/05  
5-Pin Microprocessor Supervisory Circuits With  
Watchdog Timer and Manual Reset  
________________General Description  
Features  
The MAX823/MAX824/MAX825 microprocessor (µP)  
supervisory circuits combine reset output, watchdog,  
and manual reset input functions in 5-pin SOT23 and  
SC70 packages. They significantly improve system relia-  
bility and accuracy compared to separate ICs or discrete  
components. The MAX823/MAX824/MAX825 are specifi-  
Precision Monitoring of +2.5V, +3V, +3.3V, and  
+5V Power Supplies  
Operating Current: 6µA (MAX823L/M) (SC70)  
2µA (MAX825T/S/R/Z/Y) (SC70)  
Fully Specified Over Temperature  
140ms min Power-On Reset  
cally designed to ignore fast transients on V  
.
CC  
Seven preprogrammed reset threshold voltages are  
available (see Reset Threshold Table). All three devices  
have an active-low reset output, which is guaranteed to  
Guaranteed RESET Valid to V  
= 1V  
CC  
Power-Supply Transient Immunity  
Watchdog Timer with 1.6s Timeout  
be in the correct state for V  
down to 1V. The MAX823  
CC  
(MAX823/MAX824)  
also offers a watchdog input and manual reset input.  
The MAX824 offers a watchdog input and a comple-  
mentary active-high reset. The MAX825 offers a manual  
reset input and a complementary active-high reset. The  
Selector Guide explains the functions offered in this  
series of parts.  
Manual Reset Input (MAX823/MAX825)  
No External Components  
Ordering Information  
PART  
TEMP. RANGE  
-40°C to +85°C  
-40°C to +125°C  
-40°C to +85°C  
PIN-PACKAGE  
5 SC70-5  
________________________Applications  
MAX823_EXK-T  
MAX823_EUK-T  
MAX824_EXK-T  
5 SOT23-5  
5 SC70-5  
Computers and Controllers  
Embedded Controllers  
Intelligent Instruments  
Automotive Systems  
Critical µP Monitoring  
Portable/Battery-Powered Equipment  
Insert the desired suffix letter (from the Reset Threshold table) into  
the blank to complete the part number. All devices are available in  
tape-and-reel only. There is a 2500 piece minimum order increment.  
Devices are available in both leaded and lead-free packaging.  
Specify lead-free by replacing “-T” with “+T” when ordering.  
Reset Threshold Table  
Ordering Information continued at end of data sheet.  
RESET  
THRESHOLD (V)  
SUFFIX  
______________________Selector Guide  
FUNCTION  
MAX823  
MAX824  
MAX825  
L
4.63  
4.38  
3.08  
2.93  
2.63  
2.32  
2.19  
M
Active-Low Reset  
Active-High Reset  
Watchdog Input  
T
S
R
Manual Reset Input  
Z (SC70 only)  
Y (SC70 only)  
Typical Operating Circuit appears at end of data sheet.  
Marking Information appears at end of data sheet.  
Pin Configurations  
TOP VIEW  
1
2
3
5
4
V
1
2
3
5
4
1
2
3
5
4
RESET  
GND  
MR  
RESET  
GND  
V
V
CC  
RESET  
GND  
CC  
CC  
MAX823  
MAX824  
MAX825  
WDI  
RESET  
WDI  
MR  
RESET  
SOT23/SC70  
SOT23/SC70  
SOT23/SC70  
________________________________________________________________ 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.  

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