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部品型式

LTC695CSW

製品説明
仕様・特性

LTC690/LTC691 LTC694/LTC695 Microprocessor Supervisory Circuits Features Description Guaranteed Reset Assertion at VCC = 1V n 1.5mA Maximum Supply Current n Fast (35ns Max) Onboard Gating of RAM Chip Enable Signals n SO-8 and S16 Packaging n 4.65V Precision Voltage Monitor 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 or Low Battery Warning n Thermal Limiting n Performance Specified Over Temperature n Superior Upgrade for MAX690 Family The LTC®690 family, LTC690/LTC691/LTC694/LTC695, provides complete power supply monitoring 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 external memory. In addition, the RESET output is guaranteed to remain logic low even with VCC as low as 1V. n 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. Applications n n n n 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 timeout period. Critical µP Power Monitoring Intelligent Instruments Battery-Powered Computers and Controllers 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 + VIN 10µF VOUT ADJ 5 5V + 100µF 0.1µF 3V VCC VOUT LTC690/LTC691 LTC694/LTC695 VBATT POWER TO µP 0.1µF CMOS RAM POWER µP SYSTEM µP RESET RESET 51k µP NMI PFO PFI I/O LINE GND WDI 10k 0.1µF 100Ω MICROPROCESSOR RESET, BATTERY BACK-UP, POWER FAILURE WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP FOR MICROPROCESSOR SYSTEMS 690 TA01 RESET OUTPUT VOLTAGE (V) LT®1086-5 VIN ≥ 7.5V RESET Output Voltage vs Supply Voltage TA = 25°C EXTERNAL PULL-UP = 10µA VBATT = 0V 4 3 2 1 0 0 1 3 4 2 SUPPLY VOLTAGE (V) 5 690 TA02 690ff For more information www.linear.com/690 1

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LT

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