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LTC694CN8 Datasheet(PDF) 1 Page - Linear Technology |
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LTC694CN8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC690/LTC691 LTC694/LTC695 Microprocessor Supervisory Circuits ADJ VIN VOUT 10 µF VIN ≥ 7.5V 5V 100 µF 0.1 µF µP NMI µP POWER POWER TO CMOS RAM I/O LINE µP RESET µP SYSTEM 0.1 µF 3V 51k 10k 690 TA01 LT ®1086-5 MICROPROCESSOR RESET, BATTERY BACK-UP, POWER FAILURE WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP FOR MICROPROCESSOR SYSTEMS LTC690/LTC691 LTC694/LTC695 VBATT PFI WDI RESET PFO VOUT VCC GND 0.1 µF 100 Ω + + RESET Output Voltage vs Supply Voltage s UL Recognized File # E145770 s Guaranteed Reset Assertion at VCC = 1V s 1.5mA Maximum Supply Current s Fast (35ns Max) Onboard Gating of RAM Chip Enable Signals s SO-8 and S16 Packaging s 4.65V Precision Voltage Monitor s Power OK/Reset Time Delay: 50ms, 200ms or Adjustable s Minimum External Component Count s 1 µA Maximum Standby Current s Voltage Monitor for Power-Fail or Low-Battery Warning s Thermal Limiting s Performance Specified Over Temperature s Superior Upgrade for MAX690 Family The LTC ®690 family provides complete power supply monitoring and battery control functions for microproces- sor 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 logic low even with VCC as low as 1V. 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. For an early warning of impending power failure, the LTC690 family provides 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. ® s Critical µP Power Monitoring s Intelligent Instruments s Battery-Powered Computers and Controllers s Automotive Systems SUPPLY VOLTAGE (V) 0 3 4 5 4 2 1 0 1 2 3 5 TA = 25°C EXTERNAL PULL-UP = 10 µA VBATT = 0V 690 TA02 , LTC and LT are registered trademarks of Linear Technology Corporation. FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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