DS1284 Datasheet (data sheet) PDF





DS1284 Datasheet, (DS1284 / DS1286) Watchdog Timekeepers

DS1284   DS1284  

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DS1284/DS1286 Watchdog Timekeepers www.m axim-ic.com GENERAL DESCRIPTION The DS 1284/DS1286 watchdog timekeepers are se lf-contained real-time clocks, alarms, watchdog timers, and interval timers in a 28-pin JEDEC DIP and encapsulated DI P package. The DS1286 contains an embed ded lithium energy source and a www.Dat aSheet4U.com quartz crystal, which elim inates the need for any external circui try. The DS1284 requires an external qu artz crystal and a VBAT source, which c ould be a lithium battery. Data contain ed within 64 8-bit registers can be rea d or written in the same manner as byte -wide static RAM. Data is maintained in the watchdog timekeeper

DS1284 Datasheet, (DS1284 / DS1286) Watchdog Timekeepers

DS1284   DS1284  
by intelligent control circuitry that de tects the status of VCC and write prote cts memory when VCC is out of tolerance . The lithium energy source can maintai n data and real time for over 10 years in the absence of VCC. Watchdog timekee per information includes hundredths of seconds, seconds, minutes, hours, day, date, month, and year. The date at the end of the month is automatically adjus ted for months with fewer than 31 days, including correction for leap year. Th e DS1284/DS1286 operate in either 24-ho ur or 12hour format with an AM/PM indic ator. The devices provide alarm windows and interval timing between 0.01 secon ds and 99.99 seconds. The real-time ala rm provides for preset times of up to o ne week. FEATURES Keeps Track of Hundr edths of Seconds, Seconds, Minutes, Hou rs, Days, Date of the Month, Months, an d Years; Valid Leap Year Compensation U p to 2100 Watchdog Timer Restarts an Ou t-of-Control Processor Alarm Function S chedules Real-Time-Related Activities E mbedded Lithium Energy Cell Maintains T ime, Watchdog, User RAM, and Alarm Info rmation Programmable Interrupts and Squ are-Wave Outputs Maintain JEDEC Footpri nt All Registers are Individually Addre ssable via the Address and Data Bus Acc uracy is Better than ±1 Minute/Month a t +25°C (EDIP) Greater than 10 Years of Timekeeping








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