DS1742W-150+

Real Time Clock Overview

The DS1742W-150+ is a Y2KC-compliant real-time clock and 2k x 8 nonvolatile static RAM integrated into a single 24-pin EDIP package. Operating at 3.3V, it features an internal lithium energy source that maintains data retention for over 10 years without external power. The device utilizes a standard JEDEC bytewide parallel interface, allowing clock registers to be accessed identically to static RAM locations. It includes automatic leap year compensation up to the year 2100, power-fail write protection, and a battery voltage level indicator flag.

Real Time Clock Feature Summary

• Integrated NV SRAM, RTC, crystal, power-fail control circuit, and lithium energy source
• Standard JEDEC bytewide 2k x 8 static RAM pinout with identical register access
• BCD coded timekeeping with automatic leap year compensation valid through 2100
• Power-fail write protection allows ±10% VCC supply tolerance

Real Time Clock Applications

• Systems requiring nonvolatile timekeeping and data storage in a single component
• Applications needing automatic leap year correction without software intervention
• Low-power embedded systems utilizing 3.3V logic interfaces

Real Time Clock Procurement Notes

Verify the specific suffix W-150+ indicates the 3.3V operating voltage variant. Confirm the EDIP-24 package dimensions match the design footprint. Check RoHS compliance status as indicated by the plus sign. Ensure the lead-free designation aligns with environmental regulations for the target assembly process.

Real Time Clock Selection Notes

Select this part when a combined RTC and NVSRAM solution is required to save board space. The 3.3V version is suitable for low-voltage logic families. Consider the 5V variants if the system operates strictly at 5V. Verify that the parallel interface timing requirements fit the microcontroller's bus speed.

Real Time Clock Part Context

This component belongs to the DS1742 family of Y2KC Nonvolatile Timekeeping RAMs. Other variants include the DS1742-85+, DS1742-100+, DS1742-100IND+, and DS1742W-120+. The family shares the same functional architecture but differs in operating voltage and temperature range specifications.

Real Time Clock Replacement Considerations

Direct replacements within the same package and function include DS1742W-120+ (3.3V) or DS1742-100IND+ (5V). Ensure voltage compatibility and temperature range requirements are met before substituting.