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LTC691_15

更新时间： 2024-11-06 01:09:31
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 270K
描述
Microprocessor Supervisory Circuits

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LTC691_15 数据手册

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LTC690/LTC691  
LTC694/LTC695  
Microprocessor  
Supervisory Circuits  
FeaTures  
DescripTion  
The LTC®690 family, LTC690/LTC691/LTC694/LTC695,  
provides complete power supply monitoring and battery  
control functions for microprocessor reset, battery back-  
up, CMOS RAM write protection, 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, 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 remain  
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  
n
Voltage Monitor for Power-Fail  
logic low even with V as low as 1V.  
CC  
or Low Battery Warning  
Thermal Limiting  
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.  
n
n
Performance Specified Over Temperature  
Superior Upgrade for MAX690 Family  
n
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  
Automotive Systems  
n
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
LT®1086-5  
T
= 25°C  
A
V
IN  
≥ 7.5V  
5V  
EXTERNAL PULL-UP = 10µA  
= 0V  
POWER TO  
µP  
V
V
V
CC  
V
IN  
OUT  
V
OUT  
BATT  
4
3
+
+
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  
51k  
10k  
2
1
0
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  
690ff  
1
For more information www.linear.com/690  
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