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MAX704_ESA

更新时间： 2024-11-05 11:14:59
品牌 Logo 应用领域
美信 - MAXIM 微处理器监控
页数 文件大小 规格书
12页 172K
描述
3.0V/3.3V Microprocessor Supervisory Circuits

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MAX704_ESA 数据手册

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19-0243; Rev 2; 12/05  
3.0V/3.3V Microprocessor Supervisory Circuits  
_______________General Description  
____________________________Features  
♦ RESET and RESET Outputs  
♦ Manual Reset Input  
♦ Precision Supply-Voltage Monitor  
♦ 200ms Reset Time Delay  
♦ Watchdog Timer (1.6s timeout)  
–————–  
These microprocessor (µP) supervisory circuits reduce  
the complexity and number of components required for  
power-supply monitoring and battery-control functions  
in µP systems. They significantly improve system relia-  
bility and accuracy compared to separate ICs or  
discrete components.  
These devices are designed for use in systems powered  
by 3.0V or 3.3V supplies. See the selector guide in the  
back of this data sheet for similar devices designed for  
5V systems. The suffixes denote different reset threshold  
voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see the  
Reset Threshold section in the Detailed Description). All  
these parts are available in 8-pin DIP and SO packages.  
Functions offered in this series are as follows:  
♦ Battery-Backup Power Switching—  
Battery Can Exceed VCC in Normal Operation  
♦ 40µA VCC Supply Current  
♦ 1µA Battery Supply Current  
♦ Voltage Monitor for Power-Fail or  
Low-Battery Warning  
–————–  
♦ Guaranteed RESET Assertion to VCC = 1V  
♦ 8-Pin DIP and SO Packages  
______________Ordering Information  
PART**  
TEMP RANGE  
0°C to +70°C  
PIN-PACKAGE  
8 Plastic DIP  
8 SO  
MAX690_CPA  
MAX690_CSA  
MAX690_C/D  
MAX690_EPA  
MAX690_ESA  
MAX690_MJA  
Part  
0°C to +70°C  
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
MAX690  
MAX704  
MAX802  
MAX804  
MAX805  
MAX806  
4ꢀ  
4ꢀ  
2ꢀ  
2ꢀ  
4ꢀ  
2ꢀ  
75mV  
75mV  
2ꢀ  
0°C to +70°C  
Dice*  
✓
✓
-40°C to +85°C  
-40°C to +85°C  
-55°C to +125°C  
8 Plastic DIP  
8 SO  
✓
✓
✓
✓
✓
8 CERDIP  
2ꢀ  
Ordering Information continued at end of data sheet.  
*Contact factory for dice specifications.  
75mV  
2ꢀ  
✓
**These parts offer a choice of reset threshold voltage. Select  
the letter corresponding to the desired nominal reset threshold  
voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into  
the blank to complete the part number.  
Devices in PDIP and SO 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  
Battery-Powered Computers and Controllers  
Embedded Controllers  
Intelligent Instruments  
Automotive Systems  
_________Typical Operating Circuits  
Critical µP Power Monitoring  
Portable Equipment  
REGULATED +3.3V OR +3.0V  
V
CC  
UNREGULATED  
DC  
μP  
__________________Pin Configuration  
0.1μF  
V
CC  
RESET  
RESET  
(RESET)  
R1  
R2  
TOP VIEW  
NMI  
PFO  
MAX690T/S/R  
MAX802T/S/R  
MAX804T/S/R  
MAX805T/S/R  
I/O LINE  
GND  
PFI  
WDI  
1
2
3
4
8
7
6
5
V
VBATT  
OUT  
MAX690T/S/R  
MAX704T/S/R  
MAX802T/S/R  
MAX804T/S/R  
MAX805T/S/R  
MAX806T/S/R  
3.6V  
LITHIUM  
BATTERY  
BUS  
RESET (RESET)  
WDI <MR>  
PFO  
V
CC  
V
OUT  
VBATT  
GND  
PFI  
GND  
V
CC  
CMOS RAM  
GND  
0.1μF  
0.1μF  
DIP/SO  
( ) ARE FOR MAX804T/S/R, MAX805T/S/R  
( ) ARE FOR MAX804T/S/R, MAX805T/S/R  
< > ARE FOR MAX704T/S/R, MAX806T/S/R  
See last page for MAX704T/S/R, MAX806T/S/R.  
________________________________________________________________ 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...12

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