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LTC693IN

更新时间： 2024-09-26 22:25:27
品牌 Logo 应用领域
凌特 - Linear 微处理器光电二极管监控
页数 文件大小 规格书
16页 309K
描述
Microprocessor Supervisory Circuits

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中文翻译

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LTC693IN 数据手册

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LTC692/LTC693  
Microprocessor  
Supervisory Circuits  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
■
UL Recognized  
TheLTC692/LTC693providecompletepowersupplymoni-  
toring and battery control functions for microprocessor  
reset, batterybackup, CMOSRAMwriteprotection, power  
failure warning and watchdog timing. A precise internal  
voltage reference and comparator circuit monitor the  
power supply line. When an out-of-tolerance condition  
occurs,theresetoutputsareforcedtoactivestatesandthe  
Chip Enable output unconditionally write-protects exter-  
nal memory. In addition, the RESET output is guaranteed  
to remain logic low even with VCC as low as 1V.  
®
Guaranteed Reset Assertion at VCC = 1V  
1.5mA Maximum Supply Current  
Fast (35ns Max.) On-Board Gating of RAM Chip  
Enable Signals  
■
■
■
SO8 and SO16 Packaging  
4.40V Precision Voltage Monitor  
Power OK/Reset Time Delay:  
200ms or Adjustable  
■
■
■
Minimum External Component Count  
1µA Maximum Standby Current  
Voltage Monitor for Power Fail or  
Low Battery Warning  
Thermal Limiting  
Performance Specified Over Temperature  
Superior Upgrade for MAX690 Family  
The LTC692/LTC693 power 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,  
auxiliarypower,connectedtothebatteryinputpin,powers  
the RAMs in standby through an efficient PMOS switch.  
■
■
■
For an early warning of impending power failure, the  
LTC692/LTC963 provide an internal comparator with a  
user-defined threshold. An internal watchdog timer is  
also available, which forces the reset pins to active states  
when the watchdog input is not toggled prior to a preset  
time-out period.  
O U  
PPLICATI  
S
A
■
■
■
■
Critical µP Power Monitoring  
Intelligent Instruments  
Battery-Powered Computers and Controllers  
Automotive Systems  
U
O
TYPICAL APPLICATI  
RESET Output Voltage vs  
Supply Voltage  
5
LT1086-5  
T = 25°C  
A
V
≥ 7.5V  
IN  
5V  
EXTERNAL PULL-UP = 10µA  
= 0V  
POWER TO  
µP  
V
V
OUT  
V
CC  
V
OUT  
IN  
+
+
V
4
3
BATT  
CMOS RAM POWER  
0.1µF  
0.1µF  
LTC692  
LTC693  
100µF  
10µF  
ADJ  
µP  
SYSTEM  
V
BATT  
3V  
µP RESET  
µP NMI  
RESET  
PFO  
51k  
10k  
2
1
0
I/O LINE  
PFI  
WDI  
GND  
LTC692/3 • TA01  
0.1µF  
100Ω  
MICROPROCESSOR RESET, BATTERY BACKUP, POWER FAILURE  
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP  
FOR MICROPROCESSOR SYSTEMS.  
0
1
2
3
4
5
SUPPLY VOLTAGE (V)  
LTC692/3 • TA02  
1
1234567...16

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