DS1744W-120IND+

Real Time Clock Overview

The DS1744W-120IND+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating a real-time clock/calendar and 32k x 8 static RAM. It operates at 3.3V with a 120ns access time in an industrial temperature range of -40°C to +85°C. The device uses a parallel interface where clock registers reside in the top eight RAM locations. It features automatic leap-year compensation, power-fail write protection, and a lithium energy source for over 10 years of data retention without VCC.

Real Time Clock Feature Summary

• Integrated NV SRAM (32k x 8), RTC, crystal, and lithium battery
• Y2K compliant with BCD-coded century, year, month, date, day, hours, minutes, seconds
• Power-fail write protection and automatic switchover to backup supply
• Standard JEDEC byte-wide 32k x 8 static RAM pinout

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing nonvolatile storage
• Embedded systems with strict space constraints

Real Time Clock Procurement Notes

Verify the specific suffix IND+ confirms the industrial temperature grade (-40°C to +85°C) and lead-free status. Confirm package type matches design requirements, as this model corresponds to the EDIP module. Check current availability as these components may be subject to end-of-life notices or limited stock from distributors.

Real Time Clock Selection Notes

Select the DS1744W-120IND+ when a 3.3V supply and industrial temperature range are required. Ensure the system supports parallel byte-wide access. Consider the PowerCap variant if surface-mount assembly is preferred, though this specific part number denotes the through-hole EDIP module.

Real Time Clock Part Context

This component belongs to the DS174x family of nonvolatile timekeeping RAMs. It offers pin-for-pin compatibility with other densities in the series, allowing for design flexibility across different memory requirements while maintaining identical RTC functionality and interface protocols.

Real Time Clock Replacement Considerations

Pin-compatible alternatives within the DS174x family include DS1744-70+ and DS1744P-70+. Verify voltage levels and temperature ranges match application needs before substitution.