DS1747WP-120+

Real Time Clock Overview

The DS1747WP-120+ is a Y2K-compliant nonvolatile timekeeping RAM integrating a real-time clock (RTC), static RAM, crystal, and lithium energy source. It features a 512k x 8 byte-wide SRAM interface with RTC registers mapped to the eight top memory locations. Operating at 3.3V with a 120ns access time, it provides automatic leap year compensation and power-fail write protection. The component utilizes a 34-pin PowerCap module package designed for surface-mount assembly, allowing separate mounting of the battery and crystal carrier.

Real Time Clock Feature Summary

• Integrated NV SRAM, RTC, Crystal, and Lithium Battery
• Y2K Compliant with Automatic Leap Year Compensation
• Power-Fail Write Protection Circuitry
• Battery Voltage-Level Indicator Flag

Real Time Clock Applications

• Industrial systems requiring precise timekeeping without external components
• Data logging equipment needing nonvolatile storage with calendar functions
• Embedded controllers utilizing standard JEDEC pinout compatibility

Real Time Clock Procurement Notes

Verify that the required PowerCap (DS9034PCX+ or DS9034I-PCX+) is ordered separately, as it is not included with the DS1747WP-120+. Confirm the specific industrial temperature range variant if operation below 0°C is required, as the WP suffix denotes the commercial range.

Real Time Clock Selection Notes

Select this model for applications requiring a 3.3V supply and 120ns access speed. Ensure the design accommodates the 34-pin PowerCap footprint. For environments exceeding 70°C, choose the IND+ variant (-40°C to +85°C). Verify system voltage tolerance against the 2.80V–2.97V write protection threshold.

Real Time Clock Part Context

This device belongs to the DS174xP family of nonvolatile timekeeping RAMs. It offers pin-for-pin compatibility with other densities in the series, facilitating upgrades or design changes within the same product line while maintaining identical register mapping and interface protocols.

Real Time Clock Replacement Considerations

Direct substitutes include other densities within the DS174xP family. For lower access times, consider the DS1747WP-70+. Industrial temperature variants are available as DS1747WP-120IND+.