DS1553

19-5480; Rev 8/10 www.maxim-ic.com DS1553 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM GENERAL DESCRIPTION The DS1553 is a full-function, year-2000compliant (Y2KC) real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and 8k x 8 nonvolatile static RAM. User access to all registers within the DS1553 is accomplished with a byte-wide interface as shown in Figure 1. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and leap year are made automatically. FEATURES  Integrated NV SRAM, RTC, Crystal, Power-Fail Control Circuit, and Lithium Energy Source  Clock Registers are Accessed Identically to the Static RAM; These Registers are Resident in the 16 Top RAM Locations  Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power  Precision Power-On Reset  Programmable Watchdog Timer and RTC Alarm  BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap Year Compensation Valid Up to the Year 2100  Battery Voltage Level Indicator Flag Pin Configurations appear at end of data sheet. ORDERING INFORMATION  Power-Fail Write Protection Allows for 10% VCC Power-Supply Tolerance  Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time PART VOLTAGE (V) TEMP RANGE DS1553-85+ DS1553-100+ 5.0 0°C to +70°C 5.0 0°C to +70°C DS1553W...