DS1747-70IND+

Real Time Clock Overview

The DS1747-70IND+ is a Y2K-compliant real-time clock and 512k x 8 nonvolatile static RAM integrated into a single component. It operates at a nominal 5.0V supply voltage with an industrial temperature range of -40°C to +85°C. The device features a byte-wide parallel interface, allowing RTC registers to be accessed identically to standard static RAM locations. Key specifications include a 70ns access time, automatic leap year compensation valid until 2100, and over 10 years of data retention via an internal lithium energy source.

Real Time Clock Feature Summary

• Integrated NV SRAM (512k x 8), Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source
• Y2K Compliant with BCD-Coded Century, Year, Month, Date, Day, Hours, Minutes, and Seconds
• Automatic Leap Year Compensation Valid Up to the Year 2100
• Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and nonvolatile data storage
• Embedded controllers needing Y2K-compliant calendar functions
• Equipment requiring battery-backed memory for critical configuration data

Real Time Clock Procurement Notes

Verify that the specific order suffix IND+ corresponds to the industrial temperature range (-40°C to +85°C) and lead-free/RoHS compliance status as defined in the manufacturer's ordering information. Confirm package type requirements, as this model utilizes a 32-pin EDIP module format distinct from surface-mount variants.

Real Time Clock Selection Notes

Select the DS1747-70IND+ when a combined RTC and large NVSRAM capacity is required within a single DIP package. Ensure the system design accommodates the 5.0V logic levels and parallel bus interface. Consider the PowerCap variant if surface-mount assembly or separate battery/crystal mounting is preferred to avoid reflow temperature exposure.

Real Time Clock Part Context

This component belongs to the DS174xP family of Y2K-compliant timekeeping RAMs. It is pin-for-pin compatible with other densities in the series, such as the DS1746 and DS1748, facilitating density upgrades without redesigning the host board layout. The 'IND' suffix denotes the extended industrial temperature rating.

Real Time Clock Replacement Considerations

Direct replacements within the same family include the DS1747-70+ (commercial temperature range) or other densities like the DS1746/DS1748 series which share identical pinouts. Surface-mount alternatives are available in the DS1747P series using the PowerCap module architecture.