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MAX708R

更新时间： 2024-12-01 14:57:35
品牌 Logo 应用领域
亚德诺 - ADI 监控微处理器
页数 文件大小 规格书
15页 784K
描述
监视+3V电压、低成本、微处理器监控电路

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MAX708R 数据手册

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19-0099; Rev 5; 4/06  
+3V Voltage Monitoring, Low-Cost µP  
Supervisory Circuits  
MAX706PRS/T  
General Description  
Features  
The MAX706P/R/S/T, MAX706AP/AR/AS/AT, and  
MAX708R/S/T microprocessor (µP) supervisory circuits  
reduce the complexity and number of components  
required to monitor +3V power-supply levels in +3V to  
+5V µP systems. These devices significantly improve  
system reliability and accuracy compared to separate  
ICs or discrete components.  
o µMAX Package, Small 8-Pin SO  
o Precision Supply-Voltage Monitors  
2.63V (MAX706P/R, MAX706AP/AR, and MAX708R)  
2.93V (MAX706S, MAX706AS, and MAX708S)  
3.08V (MAX706T, MAX706AT, and MAX708T)  
o 200ms Reset Time Delay  
The MAX706P/R/S/T and MAX706AP/AR/AS/AT supervi-  
sory circuits provide the following four functions:  
o Debounced TTL/CMOS-Compatible Manual Reset  
Input  
1) A reset output during power-up, power-down, and  
brownout conditions.  
o 100µA Quiescent Current  
o WDI Disable Feature (MAX706AP/AR/AS/AT)  
o Watchdog Timer: 1.6s Timeout  
2) An independent watchdog output that goes low if the  
watchdog input has not been toggled within 1.6s.  
,MX706PRS/A  
3) A 1.25V threshold detector for power-fail warning,  
low-battery detection, or for monitoring a power  
supply other than the main supply.  
o Reset Output Signal:  
Active-High Only (MAX706P, MAX706AP)  
Active-Low Only (MAX706R/S/T, MAX706AR/AS/AT)  
Active-High and Active-Low (MAX708R/S/T)  
4) An active-low, manual-reset input.  
The only difference between the MAX706R/AR,  
MAX706S/AS, and MAX706T/AT is the reset-threshold  
voltage levels, which are 2.63V, 2.93V, and 3.08V,  
respectively. All have active-low reset output signals.  
The MAX706P/AP are identical to the MAX706R/AR,  
except the reset output signal is active-high. The watch-  
dog timer function for the MAX706AP/AR/AS/AT dis-  
ables when the WDI input is left open or connected to a  
high-impedance state of a low-leakage tri-state output.  
o Voltage Monitor for Power-Fail or Low-Battery  
Warning  
o 8-Pin Surface-Mount Package  
o Guaranteed RESET Assertion to V  
= 1V  
CC  
Ordering Information  
TEMP  
RANGE  
PIN-  
PACKAGE  
PKG  
CODE  
PART†  
The MAX708R/S/T provide the same functions as the  
MAX706R/S/T and MAX706AR/AS/AT except they do  
not have a watchdog timer. Instead, they provide both  
RESET and RESET outputs. As with the MAX706,  
devices with R, S, and T suffixes have reset thresholds  
of 2.63V, 2.93V, and 3.08V, respectively.  
MAX706PCPA  
MAX706PCSA  
MAX706PCUA  
MAX706PEPA  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
-40°C to +85°C  
8 PDIP  
8 SO  
P8-1  
S8-2  
U8-1  
P8-1  
8 µMAX  
8 PDIP  
T
,MAX708RS/T  
†
SO, µMAX, and PDIP packages are available in lead-free.  
These devices are available in 8-pin SO, DIP, and  
µMAX® packages and are fully specified over the oper-  
ating temperature range.  
Ordering Information continued at end of data sheet.  
Pin Configurations appear at end of data sheet.  
Typical Operating Circuits  
Applications  
UNREGULATED  
Battery-Powered Equipment  
Portable Instruments  
Computers  
DC-DC  
DC  
CONVERTER  
+3V/+3.3V  
MAX639  
V
CC  
µP  
Controllers  
MAX706R/S/T  
MAX706AR/AS/AT  
Intelligent Instruments  
Critical µP Power Monitoring  
V
CC  
RESET  
RESET  
I/O LINE  
WDI  
WDO  
PFO  
PFI  
MR  
NMI  
PUSHBUTTON  
SWITCH  
INTERRUPT  
GND  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
Typical Operating Circuits continued 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...15

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