DS1554P-70IND

Real Time Clock Overview

The DS1554P-70IND is a Y2K-compliant, nonvolatile timekeeping RAM device featuring an integrated real-time clock (RTC), 32k x 8 static RAM, crystal, and lithium energy source. It operates at 5.0V with an industrial temperature range of -40°C to +85°C. The device utilizes a parallel interface with 15 address lines and 8 data lines. Key features include programmable watchdog timer, RTC alarm, power-fail write protection, and battery voltage monitoring. Data retention exceeds 10 years in the absence of power.

Real Time Clock Feature Summary

• Integrated 32k x 8 NV SRAM and Y2K-compliant RTC with automatic leap-year compensation
• Industrial temperature grade (-40°C to +85°C) with 5.0V supply operation
• Power-fail write protection and precision power-on reset circuitry
• Programmable watchdog timer and RTC alarm with interrupt output

Real Time Clock Applications

• Systems requiring precise timekeeping during power outages
• Data logging applications needing nonvolatile storage for timestamps
• Embedded controllers requiring watchdog timer functionality
• Y2K-compliant legacy system upgrades

Real Time Clock Procurement Notes

Verify package type compatibility; the 'P' suffix indicates a PowerCap module board requiring a separate DS9034PCX+ or DS9034I-PCX+ PowerCap component containing the crystal and battery. Confirm lead-free status via the '+' suffix. Ensure ordering includes necessary mounting hardware if surface mount assembly is planned after soldering the base.

Real Time Clock Selection Notes

Select this part for applications requiring high-density nonvolatile memory alongside RTC functions in an industrial environment. Compare with DS1554-70IND+ for commercial temperature ranges or DS1554W variants for 3.3V operation. Ensure the host system supports parallel access timing requirements (tAA max 70ns/120ns depending on speed grade).

Real Time Clock Part Context

This component belongs to the Maxim Integrated DS1554 family of nonvolatile timekeeping RAMs. It integrates silicon, RTC logic, and backup power management into a single module architecture. The PowerCap variant separates the sensitive crystal/battery assembly from the main IC to facilitate surface mount processing without thermal damage.

Real Time Clock Replacement Considerations

Direct replacements include DS1554P-70+ for commercial temperature range or DS1554P-120+/DS1554WP-120+ for 3.3V operation. Verify pinout compatibility as all variants share the same functional interface.