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MAX692A

更新时间： 2023-12-20 18:46:12
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亚德诺 - ADI 监控微处理器
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13页 639K
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微处理器监控电路

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MAX692A 数据手册

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MAX690A/MAX692A/  
MAX802L/MAX802M/  
MAX805L  
Microprocessor Supervisory Circuits  
General Description  
Features  
● Precision Supply Voltage Monitor:  
4.65V for MAX690A/MAX802L/MAX805L  
4.40V for MAX692A/MAX802M  
The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L  
reduce the complexity and number of components  
required for power-supply monitoring and battery-  
control functions in microprocessor (μP) systems. They  
significantly improve system reliability and accuracy  
compared to separate ICs or discrete components.  
● Reset Time Delay: 200ms  
● Watchdog Timer: 1.6s Timeout  
● Battery-Backup Power Switching  
● 200μA Quiescent Supply Current  
These parts provide four functions:  
1) A reset output during power-up, power-down, and  
brownout conditions.  
● 50nA Quiescent Supply Current in Battery-  
Backup Mode  
2) Battery-backup switching for CMOS RAM, CMOS μP,  
or other low-power logic.  
● Voltage Monitor for Power-Fail or Low-Battery  
Warning  
3) A reset pulse if the optional watchdog timer has not  
been toggled within 1.6s.  
● Power-Fail Accuracy Guaranteed to ±2%  
(MAX802L/M)  
4) A 1.25V threshold detector for power-fail warning or  
low-battery detection, or to monitor a power supply  
other than +5V.  
● Guaranteed RESET Assertion to V  
● 8-Pin SO and DIP Packages  
= 1V  
CC  
Ordering Information  
The parts differ in their reset-voltage threshold levels and  
reset outputs. The MAX690A/MAX802L/MAX805L generate  
a reset pulse when the supply voltage drops below 4.65V,  
and the MAX692A/MAX802M generate a reset below 4.40V.  
The MAX802L/MAX802M guarantee power-fail accuracies  
to ±2%. The MAX805L is the same as the MAX690A except  
that RESET is provided instead of RESET.  
All parts are available in 8-pin DIP and SO packages.  
The MAX690A/MAX802L are pin compatible with the  
MAX690 and MAX694. The MAX692A/MAX802M are pin  
compatible with the MAX692.  
PART  
TEMP RANGE  
0°C to +70°C  
PIN-PACKAGE  
8 Plastic DIP  
8 SO  
MAX690ACPA  
MAX690ACSA  
MAX690AC/D  
MAX690AEPA  
MAX690AESA  
MAX690AMJA  
0°C to +70°C  
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**  
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 and SO packages are available in both  
leaded and lead(Pb)-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  
● Intelligent Instruments  
● Critical μP Power Monitoring  
Typical Operating Circuit  
Pin Configurations  
UNREGULATED  
DC  
REGULATED +5V  
V
CC  
TOP VIEW  
0.1µF  
V
CC  
RESET  
RESET  
NMI  
R
1
µP  
V
OUT  
1
2
3
4
8
7
6
5
VBATT  
MAX690A  
MAX692A  
MAX802L  
MAX802M  
MAX805L  
PFO  
WDI  
MAX690A  
MAX802L  
PFI  
V
V
CC  
RESET (RESET)  
WDI  
I/O LINE  
GND  
GND  
PFI  
R
2
BATT  
V
3.6V  
LITHIUM  
OUT  
BUS  
GND  
PFO  
BATTERY  
V
CC  
CMOS  
RAM  
DIP/SO  
GND  
( ) ARE FOR MAX805L ONLY.  
19-4333; Rev 5; 4/15  
1234567...13

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