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MAX691

更新时间： 2024-11-07 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
18页 968K
描述
微处理器监控电路

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中文翻译

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MAX691 数据手册

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MAX690–MAX695  
Microprocessor Supervisory Circuits  
General Description  
Benefits and Features  
● Supervisory Function Integration Saves Board Space  
while Fully Protecting Microprocessor-Based Systems  
• Precision Voltage Monitor  
The MAX690 family of supervisory circuits reduces the  
complexity and number of components required for  
power supply monitoring and battery control functions in  
microprocessor systems. These include µP reset and  
backup-battery switchover, watchdog timer, CMOS RAM  
write protection, and power-failure warning. The MAX690  
family significantly improves system reliability and accu-  
racy compared to that obtainable with separate ICs or  
discrete components.  
- 4.65V (MAX690, MAX691, MAX694, MAX695)  
- 4.40V (MAX692, MAX693)  
• Power OK/Reset Time Delay  
- 50ms, 200ms, or Adjustable  
• Watchdog Timer  
- 100ms, 1.6s, or Adjustable  
• Battery Backup Power Switching  
• Voltage Monitor for Power Fail or Low Battery  
Warning  
The MAX690, MAX692, and MAX694 are supplied in  
8-pin packages and provide four functions:  
● A reset output during power-up, power-down, and  
• Minimum External Component Count  
brownout conditions.  
● Low Power Consumption in Battery Backup Mode  
Extends Battery Life  
● Battery backup switching for CMOS RAM, CMOS  
microprocessor or other low power logic.  
• 1µA Standby Current  
● A Reset pulse if the optional watchdog timer has not  
● Onboard Gating of Chip Enable Signals Protects  
been toggled within a specified time.  
Against Erroneous Data Written to RAM During Low  
● A 1.3V threshold detector for power fail warning, low  
battery detection, or to monitor a power supply other  
than +5V.  
V
Events  
CC  
Applications  
● Computers  
● Controllers  
● Intelligent Instruments  
● Automotive Systems  
● Critical µP Power Monitoring  
TheMAX691,MAX693,andMAX695aresuppliedin16-pin  
packages and perform all MAX690, MAX692, MAX694  
functions, plus:  
● Write protection of CMOS RAM or EEPROM.  
● Adjustable reset and watchdog timeout periods.  
● Separate outputs for indicating a watchdog timeout,  
Ordering information appears at end of data sheet.  
backup-battery switchover, and low V  
.
Pin Configurations  
CC  
TOP VIEW  
V
1
2
3
4
8
7
6
5
V
BATT  
OUT  
Typical Operating Circuit  
MAX690  
MAX692  
MAX694  
V
RESET  
WDI  
CC  
GND  
PFI  
PFO  
+5V  
V
V
V
POWER TO  
CMOS RAM  
µP  
POWER  
CC  
OUT  
BATT  
V
1
2
3
4
5
6
7
8
16 RESET  
15 RESET  
14 WDO  
13 CE IN  
12 CE OUT  
11 WDI  
BATT  
µP  
SYSTEM  
V
OUT  
MAX690  
V
CC  
MAX691  
MAX693  
MAX695  
RESET  
PFO  
µP RESET  
PFI  
GND  
BATT ON  
LOW LINE  
OSC IN  
µP NMI  
WDI  
I/O  
LINE  
GND  
10 PFO  
OSC SEL  
9 PFI  
MAX690 TYPICAL APPLICATION  
19-0218; Rev 5; 4/15  
1234567...18

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