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LTC695CSWPBF

更新时间： 2024-11-15 11:50:19
品牌 Logo 应用领域
凌特 - Linear 微处理器监控
页数 文件大小 规格书
18页 217K
描述
Microprocessor Supervisory Circuits

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LTC695CSWPBF 数据手册

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LTC690/LTC691  
LTC694/LTC695  
Microprocessor  
Supervisory Circuits  
FEATURES  
DESCRIPTION  
The LTC®690 family provides complete power supply  
monitoringandbatterycontrolfunctionsformicroprocessor  
reset,batteryback-up,CMOSRAMwriteprotection,power  
failure warning and watchdog timing. A precise internal  
voltagereferenceandcomparatorcircuitmonitorthepower  
supply line. When an out-of-tolerance condition occurs,  
the reset outputs are forced to active states and the chip  
enable output unconditionally write-protects external  
memory. In addition, the RESET output is guaranteed to  
n
Guaranteed Reset Assertion at V = 1V  
CC  
n
1.5mA Maximum Supply Current  
n
Fast (35ns Max) Onboard Gating of RAM Chip  
Enable Signals  
SO-8 and S16 Packaging  
4.65V Precision Voltage Monitor  
n
n
n
Power OK/Reset Time Delay: 50ms, 200ms  
or Adjustable  
n
Minimum External Component Count  
n
1µA Maximum Standby Current  
remain logic low even with V as low as 1V.  
CC  
n
Voltage Monitor for Power-Fail  
The LTC690 family powers the active CMOS RAMs with a  
charge pumped NMOS power switch to achieve low drop-  
out and low supply current. When primary power is lost,  
auxiliary power, connected to the battery input pin, powers  
the RAMs in standby through an efficient PMOS switch.  
or Low-Battery Warning  
Thermal Limiting  
n
n
Performance Specified Over Temperature  
n
Superior Upgrade for MAX690 Family  
APPLICATIONS  
Foranearlywarningofimpendingpowerfailure,theLTC690  
family provides an internal comparator with a user-defined  
threshold.Aninternalwatchdogtimerisalsoavailable,which  
forces the reset pins to active states when the watchdog  
input is not toggled prior to a preset timeout period.  
n
Critical μP Power Monitoring  
n
Intelligent Instruments  
n
Battery-Powered Computers and Controllers  
n
Automotive Systems  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
RESET Output Voltage  
vs Supply Voltage  
5
T
= 25°C  
A
LT®1086-5  
EXTERNAL PULL-UP = 10μA  
= 0V  
V
≥ 7.5V  
5V  
IN  
V
BATT  
POWER TO  
μP  
V
V
V
CC  
4
3
V
IN  
OUT  
OUT  
+
+
CMOS RAM POWER  
0.1μF  
3V  
0.1μF  
LTC690/LTC691  
LTC694/LTC695  
100μF  
10μF  
ADJ  
μP  
SYSTEM  
V
BATT  
μP RESET  
μP NMI  
RESET  
PFO  
2
1
0
51k  
10k  
I/O LINE  
PFI  
WDI  
GND  
690 TA01  
0.1μF 100Ω  
MICROPROCESSOR RESET, BATTERY BACK-UP, POWER FAILURE  
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP  
FOR MICROPROCESSOR SYSTEMS  
0
1
2
3
4
5
SUPPLY VOLTAGE (V)  
690 TA02  
690fe  
1
1234567...18

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