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LTC694-3.3_15

更新时间： 2024-09-28 01:15:51
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 199K
描述
3.3V Microprocessor Supervisory Circuits

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LTC694-3.3_15 数据手册

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LTC694-3.3/LTC695-3.3  
3.3V Microprocessor  
Supervisory Circuits  
FEATURES  
DESCRIPTION  
TheLTC®694-3.3/LTC695-3.3providecomplete3.3Vpower  
supply monitoring and battery control functions. These  
include power-on reset, battery back-up, RAM write pro-  
tection, power failure warning and watchdog timing. The  
devicesarepincompatibleupgradesoftheLTC694/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. Microprocessor  
reset and memory write protection are provided when the  
supply falls below 2.9V. The RESET output is guaranteed  
n
Guaranteed Reset Assertion at V = 1V  
CC  
n
Pin Compatible with LTC694/LTC695 for 3.3V Systems  
n
200μA Typical Supply Current  
Fast (30ns Typ) Onboard Gating of  
RAM Chip Enable Signals  
SO-8 and S16 Packages  
2.90V Precision Voltage Monitor  
n
n
n
n
Power OK/Reset Time Delay: 200ms or Adjustable  
n
Minimum External Component Count  
n
1μA Maximum Standby Current  
n
Voltage Monitor for Power-Fail or  
to remain logic low with V as low as 1V.  
CC  
Low-Battery Warning  
Thermal Limiting  
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.  
n
n
Performance Specified Over Temperature  
APPLICATIONS  
n
3.3V Low Power Systems  
n
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  
isalsoavailable,whichforcestheresetpinstoactivestates  
when the watchdog input is not toggled prior to a preset  
timeout period.  
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  
LT1129-3.3  
V
V
≥ 5V  
IN  
5
3.3V  
V
V
V
POWER TO  
μP  
V
IN  
OUT  
CC  
OUT  
+
+
CMOS RAM POWER  
0.1μF  
100μF  
0.1μF  
2.4V  
1μF  
OUT SENSE  
SHDN  
GND  
LTC695-3.3  
μP  
SYSTEM  
DECODER OUTPUT  
RAM CS  
μP RESET  
μP NMI  
4
3
CE IN  
BATT  
CE OUT  
RESET  
PFO  
51k  
18k  
PFI  
WDI  
I/O LINE  
2
1
0
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  
694/5-3.3 TA01  
0
1
2
3
4
5
SUPPLY VOLTAGE (V)  
694/5-3.3 TA02  
69453fb  
1
1234567...20

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