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MAX705_10

更新时间： 2024-02-23 19:28:53
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美信 - MAXIM 监控
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12页 169K
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Low-Cost, μP Supervisory Circuits

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MAX705_10 数据手册

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19-4334; Rev. 8; 3/10  
Low-Cost, µP Supervisory Circuits  
5–70/MAX813L  
_______________General Description  
___________________________Features  
o Available in Tiny µMAX Package  
The MAX705-MAX708/MAX813L microprocessor (µP)  
supervisory circuits reduce the complexity and number  
of components required to monitor power-supply and  
battery functions in µP systems. These devices signifi-  
cantly improve system reliability and accuracy com-  
pared to separate ICs or discrete components.  
o Guaranteed RESET Valid at VCC = 1V  
o Precision Supply-Voltage Monitor  
4.65V in MAX705/MAX707/MAX813L  
4.40V in MAX706/MAX708  
o 200ms Reset Pulse Width  
The MAX705/MAX706/MAX813L provide four functions:  
o Debounced TTL/CMOS-Compatible  
1) A reset output during power-up, power-down, and  
brownout conditions.  
2) An independent watchdog output that goes low if  
the watchdog input has not been toggled within 1.6  
seconds.  
3) A 1.25V threshold detector for power-fail warning,  
low-battery detection, or for monitoring a power sup-  
ply other than +5V.  
Manual-Reset Input  
o Independent Watchdog Timer—1.6s Timeout  
(MAX705/MAX706)  
o Active-High Reset Output  
(MAX707/MAX708/MAX813L)  
o Voltage Monitor for Power-Fail or Low-Battery  
Warning  
4) An active-low manual-reset input.  
The MAX707/MAX708 are the same as the MAX705/  
MAX706, except an active-high reset is substituted for  
the watchdog timer. The MAX813L is the same as the  
MAX705, except RESET is provided instead of RESET.  
______________Ordering Information  
PART  
TEMP RANGE  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
PIN-PACKAGE  
8 Plastic DIP  
8 SO  
MAX705CPA  
MAX705CSA  
MAX705CUA  
MAX705C/D  
Two supply-voltage monitor levels are available: The  
MAX705/MAX707/MAX813L generate a reset pulse when  
the supply voltage drops below 4.65V, while the  
MAX706/MAX708 generate a reset pulse below 4.40V.  
8 µMAX  
Dice*  
®
All four parts are available in 8-pin DIP, SO and µMAX  
packages.  
Ordering Information continued at end of data sheet.  
* Dice are specified at T = +25°C.  
A
**Contact factory for availability and processing to MIL-STD-883.  
Devices in PDIP, SO and µMAX packages are available in both  
leaded and lead-free packaging. Specify lead free by adding  
the + symbol at the end of the part number when ordering.  
Lead-free not available for CERDIP package.  
_______________________Applications  
Computers  
Controllers  
Intelligent Instruments  
Automotive Systems  
Critical µP Power Monitoring  
_________________Pin Configurations  
TOP VIEW  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
MR  
WDO  
1
2
3
4
8
7
6
5
V
CC  
RESET (RESET)  
WDI  
__________Typical Operating Circuit  
MAX705  
MAX706  
MAX813L  
GND  
PFI  
PFO  
UNREGULATED DC  
MAX667  
+5V DC LINEAR  
REGULATOR  
DIP/SO  
µP  
MR  
RESET  
RESET  
N.C.  
1
2
3
4
8
7
6
5
V
CC  
V
CC  
V
CC  
RESET  
PFI  
RESET  
I/O LINE  
MAX707  
MAX708  
GND  
PFI  
PFI  
MAX705  
MAX706  
MAX813L  
WDO  
PFO  
NMI  
PFO  
INTERRUPT  
MR  
PUSHBUTTON  
SWITCH  
DIP/SO  
( ) ARE FOR MAX813L ONLY.  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
1234567...12

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