DS1747WP-120IND+

Real Time Clock Overview

The DS1747WP-120IND+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating a real-time clock/calendar and 512k x 8 SRAM. It operates at a supply voltage of 3.3V with an industrial temperature range of -40°C to +85°C. The device uses a parallel interface and features a 34-pin PowerCap module package. Clock registers reside in the top eight RAM locations, providing automatic leap year compensation valid until 2100. It includes power-fail write protection and a lithium energy source for over 10 years of data retention without power.

Real Time Clock Feature Summary

• Integrates RTC, 512k NV SRAM, crystal, and lithium battery in a single surface-mountable module.
• Y2K compliant with BCD-coded century, year, month, date, day, hours, minutes, and seconds.
• Automatic leap year compensation valid up to the year 2100.
• Power-fail write protection ensures data integrity during supply voltage anomalies.

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and nonvolatile data storage.
• Embedded controllers needing integrated calendar and clock functions.
• Equipment requiring long-term data retention without external battery maintenance.

Real Time Clock Procurement Notes

Verify that the separate PowerCap component (DS9034PCX+ or DS9034I-PCX+) is ordered separately, as it contains the battery and crystal required for operation. Confirm the specific ordering suffix matches the required temperature range and voltage specifications. Ensure compatibility with the target PCB land pattern for the 34-PowerCap module package.

Real Time Clock Selection Notes

Select this model for applications requiring a 3.3V supply and industrial temperature range (-40°C to +85°C). Choose the PowerCap variant if surface-mount assembly is preferred over through-hole DIP. Ensure the system design accommodates the separate mounting of the PowerCap after soldering to protect the internal lithium source from reflow temperatures.

Real Time Clock Part Context

This component belongs to the DS174xP family of Y2K-compliant nonvolatile timekeeping RAMs. It offers pin-for-pin compatibility with other densities in the series, such as the DS1746 and DS1748. The WP suffix indicates the PowerCap module package, distinguishing it from the standard EDIP DIP modules.

Real Time Clock Replacement Considerations

Pin-for-pin compatible with other DS174xP series devices like the DS1746WP-120IND+ and DS1748WP-120IND+. Verify memory density requirements when substituting, as these variants offer different SRAM capacities while maintaining identical RTC functionality and pinouts.