DS1743WP-120

Real Time Clock Overview

The DS1743WP-120+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating an 8k x 8 static RAM and a real-time clock/calendar. It operates at 3.3V with a parallel interface and utilizes a 34-pin PowerCap module package. The device includes an integrated lithium energy source, crystal, and power-fail control circuitry. Clock registers reside in the top eight RAM locations, accessed via a standard JEDEC bytewide pinout. It provides automatic leap year compensation through 2099 and features low-battery indicators.

Real Time Clock Feature Summary

• Integrated NV SRAM (8k x 8), RTC, crystal, and lithium battery in a single surface-mountable module.
• Y2K-compliant BCD-coded calendar with automatic leap year compensation valid through 2099.
• Power-fail write protection ensures data integrity during supply voltage fluctuations.
• Lithium energy source remains electrically disconnected until first power application to preserve freshness.

Real Time Clock Applications

• Industrial systems requiring precise timekeeping without external components.
• Embedded controllers needing nonvolatile storage for configuration data alongside RTC functions.
• Equipment requiring Y2K compliance and long-term data retention in the absence of main power.

Real Time Clock Procurement Notes

Verify that the separate PowerCap component (DS9034PCX+ or DS9034I-PCX+) is ordered independently, as it is required for operation but not included with the DS1743WP-120+. Confirm the specific suffix indicates lead-free/RoHS compliance if required by assembly specifications.

Real Time Clock Selection Notes

Select this model for applications requiring a 3.3V supply and surface-mount assembly. Ensure the design accommodates the 34-pin PowerCap footprint. Verify that the ±10% VCC tolerance aligns with the system power rail stability requirements.

Real Time Clock Part Context

This part belongs to the DS1743 family of nonvolatile timekeeping RAMs. It is functionally compatible with other densities in the DS174x series, sharing the same pinout and register map. The 'W' suffix denotes the 3.3V version, while 'P' indicates the PowerCap package type.

Real Time Clock Replacement Considerations

Pin-for-pin compatible with other DS174x series devices such as the DS1743W-120+ (EDIP package) or DS1743P-100+ (5V PowerCap). Verify voltage compatibility when substituting between 3.3V and 5V variants.