DS1743W-150

Real Time Clock Overview

The DS1743W-150 is a Y2K-compliant, nonvolatile timekeeping RAM integrating an 8k x 8 static RAM and a real-time clock/calendar. It operates on a single 3.3V supply within the commercial temperature range of 0°C to +70°C. The device features a standard JEDEC bytewide 8-bit parallel interface with direct addressing. Key functions include BCD-coded timekeeping with automatic leap year compensation through 2099, power-fail write protection, and a low-battery indicator. The integrated lithium energy source ensures data retention for over 10 years without external power.

Real Time Clock Feature Summary

• Integrated NV SRAM (8k x 8), RTC, crystal, and lithium battery in a 28-pin EDIP module
• BCD-coded calendar/clock with automatic leap year compensation valid through 2099
• Power-fail write protection allows ±10% VCC tolerance
• Low-battery-voltage level indicator flag

Real Time Clock Applications

• Industrial systems requiring precise timekeeping during power outages
• Data logging equipment needing nonvolatile storage for timestamps
• Embedded controllers requiring Y2K-compliant date handling

Real Time Clock Procurement Notes

Verify component authenticity due to discontinued status. Confirm RoHS compliance as indicated by the '+' suffix in ordering information. Check for specific revision errata via manufacturer documentation before integration into new designs.

Real Time Clock Selection Notes

Select this model for 3.3V logic compatibility. Ensure the system utilizes a 28-pin DIP footprint. Verify that the application does not require industrial temperature ratings (-40°C to +85°C), which necessitates the IND variant.

Real Time Clock Part Context

Part of the DS174X family of nonvolatile timekeeping RAMs. Pin-compatible with other densities in the series. Manufactured originally by Dallas Semiconductor, now under Analog Devices/Maxim Integrated.

Real Time Clock Replacement Considerations

Consult official cross-reference lists for pin-compatible alternatives. Consider modern RTC/SRAM combinations if lead-free or industrial grade requirements differ.