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MAX690A

更新时间： 2024-11-22 22:55:15
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 99K
描述
Microprocessor Supervisory Circuits

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MAX690A 数据手册

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19-4333; Rev 3; 9/93  
Mic ro p ro c e s s o r S u p e rvis o ry Circ u it s  
692/MAX805L  
__________________Ge ne ra l De s c ription  
___________________________Fe a t u re s  
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 signifi-  
cantly improve system reliability and accuracy compared  
to separate ICs or discrete components.  
♦ Precision Supply-Voltage Monitor:  
4.65V for MAX690A/MAX802L/MAX805L  
4.40V for MAX692A/MAX802M  
♦ Reset Time Delay – 200ms  
♦ Watchdog Timer – 1.6sec 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 1.6sec.  
♦ Power-Fail Accuracy Guaranteed to ±2%  
4) A 1.25V threshold detector for power-fail warning or  
low-battery detection, or to monitor a power supply  
other than +5V.  
(MAX802L/M)  
♦ Guaranteed RESET Assertion to VCC = 1V  
♦ 8-Pin SO and DIP Packages  
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 guaran-  
tee power-fail accuracies to ±2%. The MAX805L is the  
same as the MAX690A except that RESET is provided  
instead of RESET.  
______________Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
MAX690ACPA  
MAX690ACSA  
MAX690AC/D  
MAX690AEPA  
MAX690AESA  
MAX690AMJA  
8
Plastic DIP  
0°C to +70°C  
8 SO  
0°C to +70°C  
Dice*  
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.  
-40°C to +85°C  
-40°C to +85°C  
-55°C to +125°C  
8
8
8
Plastic DIP  
SO  
CERDIP**  
_______________________Ap p lic a t io n s  
Ordering Information continued on last page.  
* Dice are specified at TA = +25°C  
**Contact factory for availability and processing to MIL-STD-883.  
Battery-Powered Computers and Controllers  
Intelligent Instruments  
Automotive Systems  
Critical µP Power Monitoring  
_________________P in Co n fig u ra t io n s  
__________Typ ic a l Op e ra t in g Circ u it  
TOP VIEW  
UNREGULATED DC REGULATED +5V  
V
CC  
V
OUT  
1
2
3
4
O.1µF  
8
7
6
5
VBATT  
V
CC  
RESET  
R
1
RESET  
PFO  
MAX690A  
MAX692A  
MAX802L  
MAX802M  
MAX805L  
V
CC  
RESET (RESET)  
WDI  
µP  
NMI  
GND  
PFI  
PFI  
WDI  
I/O LINE  
GND  
3.6V  
LITHIUM  
BATTERY  
R
2
PFO  
V
BATT  
V
OUT  
GND  
DIP/SO  
V
CC  
CMOS  
RAM  
MAX690A  
MAX802L  
(
) ARE FOR MAX805L ONLY.  
GND  
________________________________________________________________ Maxim Integrated Products  
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .  
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