DS1744WP-120IND+

Real Time Clock Overview

The DS1744WP-120IND+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating a real-time clock/calendar and 32k x 8 SRAM. It operates at 3.3V with an industrial temperature range of -40°C to +85°C. The device uses a 34-pin PowerCap module package, requiring a separate DS9034 PCX battery/crystal module. It features BCD-coded time/date registers with automatic leap-year compensation up to 2100. Data retention exceeds 10 years via an internal lithium source that disconnects until first power application.

Real Time Clock Feature Summary

• Integrates RTC, 32k NV SRAM, crystal interface, and power-fail control in one component
• Y2K compliant with century byte register and automatic leap-year correction valid through 2100
• Power-fail write protection ensures data integrity during supply voltage outages
• Lithium energy source electrically disconnected until initial VCC application to preserve shelf life

Real Time Clock Applications

• Industrial systems requiring precise timekeeping without external batteries
• Data logging equipment needing nonvolatile storage for timestamps
• Embedded controllers requiring Y2K-compliant calendar functions
• Systems utilizing surface-mountable RTC modules with replaceable PowerCap batteries

Real Time Clock Procurement Notes

Verify the specific ordering suffix matches the required package type (WP indicates PowerCap module board). Confirm the IND suffix corresponds to the industrial temperature grade (-40°C to +85°C). Ensure the DS9034PCX or DS9034I-PCX PowerCap module is ordered separately as it is not included with the DS1744WP part number.

Real Time Clock Selection Notes

Select this model when a 3.3V logic interface is required alongside nonvolatile memory and RTC functionality. The WP variant is suitable for surface-mount assembly where the battery and crystal are added post-reflow. Compare against the EDIP version if through-hole mounting or integrated crystal/battery within the DIP package is preferred instead of a separate PowerCap module.

Real Time Clock Part Context

This component belongs to the Maxim Integrated DS174x family of Y2K-compliant timekeeping RAMs. It shares pinout compatibility with other densities in the series, facilitating design upgrades. The DS1744 specifically offers 32k bytes of nonvolatile storage combined with full calendar and clock capabilities in a single package.

Real Time Clock Replacement Considerations

Pin-for-pin compatible with other densities of the DS174xP timekeeping RAM series. Verify voltage levels (3.3V vs 5V) and package type (EDIP vs PowerCap) when substituting. Ensure the replacement part supports the required industrial temperature range if operating conditions exceed commercial limits.