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LTC693CN Datasheet(PDF) 1 Page - Linear Technology |
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LTC693CN Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC692/LTC693 ® s UL Recognized s Guaranteed Reset Assertion at VCC = 1V s 1.5mA Maximum Supply Current s Fast (35ns Max.) On-Board Gating of RAM Chip Enable Signals s SO8 and SO16 Packaging s 4.40V Precision Voltage Monitor s Power OK/Reset Time Delay: 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 LTC692/LTC693 provide complete power supply moni- toring and battery control functions for microprocessor reset, battery backup, 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 exter- nal memory. In addition, the RESET output is guaranteed to remain logic low even with VCC as low as 1V. 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, 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 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. DESCRIPTIO S FEATURE APPLICATI TYPICAL RESET Output Voltage vs Supply Voltage + + 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 0.1µF 3V 51k 10k LTC692/3 • TA01 LT1086-5 MICROPROCESSOR RESET, BATTERY BACKUP, POWER FAILURE WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP FOR MICROPROCESSOR SYSTEMS. LTC692 LTC693 VBATT PFI WDI RESET PFO VOUT VCC GND 0.1 µF 100 Ω Microprocessor Supervisory Circuits SUPPLY VOLTAGE (V) 0 3 4 5 4 2 1 0 1 2 3 5 TA = 25°C EXTERNAL PULL-UP = 10µA VBATT = 0V LTC692/3 • TA02 ® S APPLICATI s Critical µP Power Monitoring s Intelligent Instruments s Battery-Powered Computers and Controllers s Automotive Systems |
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