DS17487-3IND+

Real Time Clock Overview

The DS17487-3IND+ is a real-time clock (RTC) IC from the DS17x87 series, manufactured by Analog Devices Inc./Maxim Integrated. It integrates a quartz crystal and lithium energy source within a 24-pin encapsulated DIP (EDIP) package. The device provides timekeeping for seconds, minutes, hours, day, date, month, and year with leap-year compensation through 2099. It features 4096 bytes of battery-backed NV SRAM and operates on a multiplexed byte-wide interface. Electrical specifications include a supply voltage range of 2.7V to 3.7V and an industrial operating temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated quartz crystal and lithium battery in a 24-pin EDIP package
• 4096 bytes of battery-backed nonvolatile SRAM
• Multiplexed byte-wide address/data bus interface
• Automatic power-fail detection and switching circuitry
• System power-on control via wake-up alarm or kickstart input

Real Time Clock Applications

• Embedded systems requiring precise timekeeping
• Utility meters
• Security systems
• Network hubs, bridges, and routers

Real Time Clock Procurement Notes

Verify the specific suffix IND+ indicates the industrial temperature grade (-40°C to +85°C). Confirm the EDIP package type matches the design requirements. Check current availability status as these components may have limited stock or end-of-life implications. Ensure the ordering information aligns with the verified local source material provided.

Real Time Clock Selection Notes

Select this component when an integrated RTC with onboard battery and crystal is required to save board space. The DS17487 variant offers 4KB of extended RAM compared to 2KB in the DS17287. Verify that the system supports the multiplexed bus interface and that the 2.7V to 3.7V VCC range is compatible with the primary power supply.

Real Time Clock Part Context

This part belongs to the DS17x87 family, which serves as a successor to the industry-standard DS12887. Unlike the DS17x85 series which requires external crystals and batteries, the DS17x87 modules encapsulate these elements. The DS17487 specifically distinguishes itself by providing 4096 bytes of NV SRAM, whereas the DS17287 provides 2048 bytes and the DS17887 provides 8192 bytes.

Real Time Clock Replacement Considerations

Direct replacements within the same family include the DS17287-3IND+ (2KB RAM) and DS17887-3IND+ (8KB RAM), assuming pin compatibility and memory size adjustments are acceptable. Other variants like the DS17487-5IND+ offer 5V operation instead of 3V.