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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1235CSW датащи(PDF) 1 Page - Linear Technology |
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LTC1235CSW датащи(HTML) 1 Page - Linear Technology |
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1 / 16 page  LTC1235 1 1235fa TYPICAL APPLICATION DESCRIPTION Microprocessor Supervisory Circuit Battery Life vs Backup Duty Cycle L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. FEATURES APPLICATIONS n Guaranteed Reset Assertion at VCC = 1V n 1.5mA Maximum Supply Current n Fast (35ns Max.) Onboard Gating of RAM Chip Enable Signals n Conditional Battery Backup Extends Battery Life n 4.65V Precision Voltage Monitor n Power OK/Reset Time Delay: 200ms n External Reset Control 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 All the LTC695 Features Plus Conditional Battery Backup and External Reset Control n Critical μP Power Monitoring n Intelligent Instruments n Battery-Powered Computers and Controllers n Automotive Systems The LTC®1235 provides complete power supply monitoring and battery control functions for microprocessor reset, battery backup, RAM write protection, power failure warn- ing and watchdog timing. The LTC1235 has all the LTC695 features plus conditional battery backup and external reset control. When an out-of-tolerance power supply condition occurs, the reset outputs are forced to active states and the Chip Enable output write-protects external memory. The RESET output is guaranteed to remain logic low with VCC as low as 1V. External reset control is provided by a debounced pushbutton reset input. The LTC1235 powers the active CMOS 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, provides backup power to the RAMs. The LTC1235 can be programmed by a P signal to either back up the RAMs or not. This extends the battery life in situations where RAM data need not always be saved when power goes down. For an early warning of impending power failure, the LTC1235 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 the time-out period. + + ADJ VIN VOUT 10μF VIN ≥ 7.5V +5V 100μF 0.1μF LTC1235 VOUT VCC VBATT PFI WDI μP NMI μP POWER POWER TO CMOS RAM I/O LINE μP RESET μP SYSTEM 0.1μF +3V 51k 10k 1235 TA1 RESET PFO LT1086-5 THE LTC1235 EXTENDS BATTERY LIFE BY PROVIDING BATTERY POWER ONLY WHEN REQUIRED TO BACK UP RAM DATA. IT SAVES THE BATTERY WHEN NO DATA BACKUP IS NEEDED. THE μP REQUESTS BACKUP WITH THE BACKUP PIN. I/O LINE BACKUP PB RST BACKUP DUTY CYCLE (%) 0 6 8 10 80 1235 TA02 4 2 0 20 40 60 100 1 3 5 7 9 LTC1235 LTC695 (WITHOUT CONDITIONAL BATTERY BACKUP) |
Аналогичный номер детали - LTC1235CSW |
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Аналогичное описание - LTC1235CSW |
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