DS1746WP-120IND+

Real Time Clock Overview

The DS1746WP-120IND+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating a real-time clock/calendar and 128k x 8 static RAM. Operating at 3.3V with an industrial temperature range of -40°C to +85°C, it uses a 34-pin PowerCap module package. The device features BCD-coded registers for century, year, month, date, day, hours, minutes, and seconds, including automatic leap year compensation valid until 2100. It provides over 10 years of data retention via an integrated lithium energy source that remains disconnected until initial power application.

Real Time Clock Feature Summary

• Integrates NV SRAM, RTC, crystal, power-fail control circuit, and lithium battery in a single surface-mountable module.
• Y2K compliant with BCD-coded registers and automatic leap year compensation valid through the year 2100.
• Power-fail write protection ensures data integrity during supply voltage fluctuations within ±10% tolerance.
• Lithium energy source is electrically isolated until first power application to preserve full battery capacity.

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and nonvolatile data storage in harsh environments.
• Embedded controllers needing Y2K-compliant calendar functions without external components.
• Equipment requiring long-term data retention (over 10 years) independent of main system power.

Real Time Clock Procurement Notes

Verify the specific ordering suffix matches the required voltage and temperature grade. Confirm compatibility with the separate DS9034 PCX+ or DS9034I-PCX+ PowerCap modules, which must be ordered separately to complete the assembly. Ensure the design accommodates the 34-pin PowerCap Module Board footprint.

Real Time Clock Selection Notes

Select this model for applications requiring 3.3V operation and industrial temperature stability (-40°C to +85°C). Choose the WP variant when surface-mount assembly is preferred over DIP packaging. Note that the DS9034 PowerCap containing the battery and crystal is not included and requires separate procurement.

Real Time Clock Part Context

This component belongs to the Maxim Integrated DS174x family of nonvolatile timekeeping RAMs. It offers pin-for-pin compatibility with other densities in the series, such as the DS1746P and DS1746W variants. The WP designation specifically indicates the 34-pin PowerCap module package designed for direct connection to a separate PowerCap battery and crystal assembly.

Real Time Clock Replacement Considerations

Pin-for-pin compatible with other DS174xP timekeeping RAM densities. Verify voltage requirements (3.3V vs 5V) and temperature ranges when substituting with other DS1746 or DS1747 variants.