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MAX696

更新时间： 2023-12-20 18:46:19
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亚德诺 - ADI 监控微处理器
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16页 1005K
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微处理器监控电路

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MAX696 数据手册

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MAX696/MAX697  
Microprocessor Supervisory Circuits  
General Description  
Features  
● Adjustable Low-Line Monitor and Power-Down Reset  
● Power-OK/Reset Time Delay  
The MAX696/MAX697 supervisory circuits reduce the  
complexity and number of components required for  
power-supply monitoring and battery-control functions  
in microprocessor (μP) systems. These include μP reset  
and backup-battery switchover, watchdog timer, CMOS  
RAM write protection, and power-failure warning. The  
MAX696/MAX697 significantly improve system reliability  
and accuracy compared to that obtained with separate  
ICs or discrete components.  
● Watchdog Timer—100ms, 1.6s, or Adjustable  
● Minimum Component Count  
● 1μA Standby Current  
● Battery-Backup Power Switching (MAX696)  
● On-Board Gating of Chip-Enable Signals (MAX697)  
● Separate Monitor for Power-Fail or Low-Battery  
Warning  
The MAX696 and MAX697 are supplied in 16-pin pack-  
ages and perform six functions:  
Ordering Information  
1) A reset output during power-up, power-down, and  
brownout conditions. The threshold for this “lowline”  
reset is adjustable by an external voltagedivider.  
PART  
TEMP RANGE  
0°C to +70°C  
PIN-PACKAGE  
Dice  
MAX696C/D  
MAX696CPE  
MAX696CWE  
MAX696EPE  
MAX696EJE  
MAX696EWE  
MAX696MJE  
0°C to +70°C  
16 PDIP  
2) A reset pulse if the optional watchdog timer has not  
been toggled within a specified time.  
0°C to +70°C  
16 Wide SO  
16 PDIP  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-55°C to +125°C  
3) Individual outputs for low-line and watchdog fault con-  
16 CERDIP  
16 Wide SO  
16 CERDIP  
ditions.  
4) The reset time may be left at its default value of 50ms,  
or may be varied with an external capacitor or clock  
pulses.  
Ordering Information continued at end of data sheet.  
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.  
5) A separate 1.3V threshold detector for power-fail warn-  
ing, low-battery detection, or to monitor a power supply  
other than V  
.
CC  
Pin Configurations  
The MAX696 also has battery-backup switching for CMOS  
RAM, CMOS microprocessor, or other lowpower logic.  
TOP VIEW  
The MAX697 lacks battery-backup switching, but has  
write-protection pins (CE IN and CE OUT) for CMOS  
RAM or EPROM. In addition, it consumes less than 250  
microamperes.  
16  
15  
14  
V
1
2
RESET  
RESET  
WDO  
BATT  
V
OUT  
V
3
CC  
Applications  
● Computers  
● Controllers  
● Intelligent Instruments  
● Critical μP Power Monitoring  
MAX696  
13 LLIN  
12 N.C.  
11 WDI  
4
5
6
GND  
BATT ON  
LOW LINE  
OSC IN  
10  
9
PFO  
7
8
Typical Operating Circuit appears at end of data sheet.  
Pin Configurations continued at end of data sheet.  
PFI  
OSC SEL  
19-0829; Rev 5; 7/14  
1234567...16

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