19-5480; Rev 8/10
www.maxim-ic.com
DS1553
64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM
GENERAL DESCRIPTION
...
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...