DS1553
64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM
Part Details
- 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
- 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
The DS1553 is a full-function, year-2000-compliant (Y2KC) real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and "8k x 8 nonvolatile static RAM (NV SRAM)." User access to all registers within the DS1553 is accomplished with a bytewide 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.
Documentation
Data Sheet 1
Reliability Data 1
Application Note 1
Design Note 3
Technical Articles 2
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Nonvolatile Timekeeping RAMs 1 | ||
| DS9034PCX | PowerCap with Crystal | |
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