DS1743WP-120IND+

Real Time Clock Overview

The DS1743WP-120IND+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating an RTC and 8k x 8 SRAM. It operates at 3.3V with a 120ns access time in industrial temperature ranges (-40°C to +85°C). The device uses a 34-pin PowerCap module package, requiring a separate DS9034PCX or DS9034I-PCX battery/crystal unit. It features BCD-coded time/date registers with automatic leap year compensation through 2099, power-fail write protection, and over 10 years of data retention via an internal lithium source.

Real Time Clock Feature Summary

• Integrated NV SRAM (8k x 8), RTC, crystal interface, and power-fail control circuit
• Y2K-compliant with BCD-coded century, year, month, date, day, hours, minutes, and seconds
• Automatic leap year compensation valid through 2099
• Power-fail write protection ensures data integrity during supply voltage anomalies

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and nonvolatile storage
• Embedded controllers needing Y2K-compliant calendar functions
• Equipment requiring extended data retention without continuous main power

Real Time Clock Procurement Notes

Verify the specific ordering suffix IND+ confirms the -40°C to +85°C operating range and 3.3V supply requirement. Confirm that the required PowerCap module (DS9034PCX+ or DS9034I-PCX+) is ordered separately, as it is not included with the DS1743WP-120IND+. Check for lead-free/RoHS compliance status indicated by the '+' suffix.

Real Time Clock Selection Notes

Select this part when a 3.3V logic interface and surface-mountable RTC/NVRAM combination are needed. Ensure the design accommodates the separate PowerCap module for the crystal and battery. Compare against other densities in the DS174x family if different memory sizes are required, noting pin compatibility across the series.

Real Time Clock Part Context

This component belongs to the DS174x family of Y2K-compliant nonvolatile timekeeping RAMs from Maxim Integrated/Analog Devices. It offers pin-for-pin compatibility with other densities in the series, allowing for design flexibility while maintaining the same RTC register map and interface protocol.

Real Time Clock Replacement Considerations

Pin-compatible alternatives within the DS174x family include DS1744, DS1746, and DS1747, provided the memory density requirements match. Verify that any substitute maintains the 3.3V operation and industrial temperature rating.