DS1554-70

Real Time Clock Overview

The DS1554-70 is a 256k nonvolatile, Y2K-compliant timekeeping RAM integrating a real-time clock (RTC), static RAM, crystal, and lithium energy source. It operates at 5.0V with a commercial temperature range of 0°C to +70°C in a 32-pin EDIP package. The device features BCD-coded registers for century, year, month, date, day, hours, minutes, and seconds, including automatic leap-year compensation valid through 2100. It provides programmable watchdog timer and RTC alarm functions, power-fail write protection, and battery voltage-level indication.

Real Time Clock Feature Summary

• Integrated NV SRAM, RTC, Crystal, Power-Fail Control Circuit, and Lithium Energy Source
• Y2K Compliant with Century Byte Register and Automatic Leap-Year Compensation Valid Up to Year 2100
• Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
• Programmable Watchdog Timer and RTC Alarm with Interrupt Output

Real Time Clock Applications

• Systems requiring precise timekeeping and data retention during power outages
• Industrial equipment needing Y2K compliance and long-term battery backup
• Embedded controllers utilizing integrated watchdog and alarm functionalities

Real Time Clock Procurement Notes

Verify the specific suffix against the ordering information table to confirm the exact temperature range and package type. The DS1554-70 designation corresponds to the commercial grade (0°C to +70°C) in the 32-pin EDIP package. Ensure compatibility with the required voltage level and interface timing specifications before procurement.

Real Time Clock Selection Notes

Select the DS1554-70 when a 5V supply is available and the commercial temperature range suffices. For industrial environments (-40°C to +85°C), choose the DS1554-70IND+ variant. If surface-mount assembly is preferred without exposing the internal battery to reflow temperatures, consider the PowerCap module versions instead of the DIP package.

Real Time Clock Part Context

The DS1554 belongs to Maxim Integrated's family of nonvolatile timekeeping RAMs. It combines memory and clocking functions into a single component, reducing board space compared to discrete solutions. The device is designed for applications where data integrity and accurate time tracking are critical, offering a self-contained solution with minimal external components.

Real Time Clock Replacement Considerations

For industrial temperature requirements, use DS1554-70IND+. For 3.3V operation, select DS1554W-120+ or DS1554WP-120+ variants. Surface-mount alternatives include the DS1554P series paired with the DS9034PCX PowerCap module.