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LTC695ISW-3.3#TRPBF PDF预览

LTC695ISW-3.3#TRPBF

更新时间： 2024-11-09 13:09:55
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凌特 - Linear 电源电路电源管理电路微处理器光电二极管监控
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LTC695ISW-3.3#TRPBF 数据手册

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LTC694-3.3/ LTC695-3.3  
3.3V Mic ro p ro c e sso r  
Sup e rviso ry Circ uits  
U
FEATURES  
DESCRIPTIO  
■
UL Recognized ®  
File # E145770  
The LTC®694-3.3/LTC695-3.3 provide complete 3.3V  
power supply monitoring and battery control functions.  
Theseincludepower-onreset,batteryback-up,RAMwrite  
protection, power failure warning and watchdog timing.  
The devices are pin compatible upgrades of the LTC694/  
LTC695 that are optimized for 3.3V systems. Operating  
power consumption has been reduced to 0.6mW (typical)  
and 3µW maximum in battery back-up mode. Micropro-  
cessor reset and memory write protection are provided  
when the supply falls below 2.9V. The RESET output is  
■
Guaranteed Reset Assertion at VCC = 1V  
Pin Compatible with LTC694/LTC695  
for 3.3V Systems  
■
■
■
200µA Typical Supply Current  
Fast (30ns Typ) On-Board Gating of  
RAM Chip Enable Signals  
■
■
■
■
■
■
SO-8 and S16 Packages  
2.90V 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  
guaranteed to remain logic low with V as low as 1V.  
CC  
The LTC694-3.3/LTC695-3.3 power the active RAMs with  
a charge pumped NMOS power switch to achieve low  
dropout 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.  
■
■
Thermal Limiting  
Performance Specified Over Temperature  
U
APPLICATIO S  
For an early warning of impending power failure, the  
LTC694-3.3/LTC695-3.3 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.  
■
3.3V Low Power Systems  
Critical µP Power Monitoring  
Intelligent Instruments  
Battery-Powered Computers and Controllers  
■
■
■
■
Automotive Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
RESET Output Voltage vs  
Supply Voltage  
5
LT1129-3.3  
V
V
IN  
≥ 5V  
3.3V  
V
IN  
V
V
POWER TO  
CMOS RAM POWER  
µP  
V
OUT  
CC  
OUT  
+
+
0.1µF  
4
3
100µF  
0.1µF  
1µF  
OUT SENSE  
SHDN  
GND  
LTC695-3.3  
µP  
SYSTEM  
DECODER OUTPUT  
RAM CS  
µP RESET  
µP NMI  
CE IN  
BATT  
CE OUT  
RESET  
PFO  
2.4V  
51k  
18k  
2
1
0
PFI  
WDI  
I/O LINE  
GND  
MICROPROCESSOR RESET, BATTERY BACK-UP,  
100Ω  
RAM WRITE PROTECTION, POWER WARNING AND  
WATCHDOG TIMING ARE ALL IN A SINGLE CHIP  
FOR 3.3V MICROPROCESSOR SYSTEM  
0.1µF  
0
1
2
3
4
5
694/5-3.3 TA01  
SUPPLY VOLTAGE (V)  
694/5-3.3 TA02  
1
1234567...16

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LTC695ISW-3.3#TRPBF 替代型号

型号 品牌 替代类型 描述 数据表
LTC695ISW-3.3#PBF Linear

完全替代

 LTC695-3.3 - 3.3V Microprocessor Supervisory Circuits; Package: SO; Pins: 16; Temperature
ADM693ARZ ADI

功能相似

 Microprocessor Supervisor with Backup Battery Switchover, Watchdog Feature, Power Fail War
ADM695ANZ ADI

功能相似

 Microprocessor Supervisory Circuits

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