DS1744P-70IND+

Real Time Clock Overview

The DS1744P-70IND+ is a Y2K-compliant, nonvolatile timekeeping RAM featuring an integrated real-time clock/calendar and 32k x 8 SRAM. Operating at 5V with an industrial temperature range of -40°C to +85°C, it utilizes a 34-pin PowerCap module package. The device provides automatic leap-year compensation up to the year 2100 and includes power-fail write protection. It maintains data retention for over 10 years using an internal lithium energy source that remains disconnected until initial power application.

Real Time Clock Feature Summary

• Integrated NV SRAM, RTC, crystal, and lithium battery in a single 34-pin PowerCap module
• Y2K compliant with BCD-coded registers and automatic leap-year compensation valid through 2100
• Power-fail write protection ensures data integrity during supply voltage anomalies
• Battery longevity indicator flag monitors internal lithium energy source status

Real Time Clock Applications

• Industrial systems requiring precise timekeeping without external components
• Data logging equipment needing nonvolatile storage with calendar functions
• Embedded controllers requiring Y2K compliance and extended battery life

Real Time Clock Procurement Notes

Verify the specific ordering suffix IND+ confirms the industrial temperature grade (-40°C to +85°C) and lead-free/RoHS compliance. Confirm the requirement for the separate DS9034PCX+ or DS9034I-PCX+ PowerCap component, as the DS1744P module board does not include the battery or crystal internally.

Real Time Clock Selection Notes

Select this part when a surface-mountable base with integrated contacts is preferred over the fully encapsulated EDIP DIP module. Ensure the design accommodates the separate mounting of the PowerCap after reflow soldering to protect the battery from high temperatures. Verify system compatibility with the standard JEDEC byte-wide static RAM pinout.

Real Time Clock Part Context

This component belongs to the DS174xP family of Y2K-compliant nonvolatile timekeeping RAMs. It is functionally compatible with other densities in the series, allowing for density upgrades within the same package footprint. The 'P' designation specifically indicates the PowerCap module board configuration designed for direct connection to external PowerCap units.

Real Time Clock Replacement Considerations

Direct substitutes within the same package type include other DS1744P variants such as DS1744P-70+ (commercial temperature) or DS1744WP-120+/DS1744WP-120IND+ (3.3V operation). Pin-for-pin compatibility exists across the DS174xP series, but voltage and temperature specifications must match the application requirements.