DS1687-5IND

Real Time Clock Overview

The DS1687-5IND is a standalone real-time clock (RTC) in an EDIP-24 package, integrating the RTC chip, a 32.768kHz crystal, and a lithium battery. It operates on a +5V supply with a range of 4.5V to 5.5V and supports an industrial temperature range of -40°C to +85°C. The device provides timekeeping through 2099, featuring a multiplexed address/data bus interface, 242 bytes of battery-backed NV RAM, and a 64-bit silicon serial number. Key functions include system power-on via alarm or key closure, a 32kHz square-wave output, and Y2K compliance.

Real Time Clock Feature Summary

• Integrated EDIP package containing RTC, crystal, and lithium battery for self-contained operation
• Multiplexed bidirectional address/data bus interface compatible with standard PC clocks
• Power-control circuitry enabling system wake-up from date/time alarms or kickstart inputs
• 242 bytes of non-volatile user RAM with auxiliary battery support

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify that the specific part number matches the required voltage and temperature grade. The 'IND' suffix indicates an industrial temperature range (-40°C to +85°C), while the '5' denotes +5V operation. Confirm the EDIP-24 package dimensions align with the PCB footprint. Ensure the integrated battery retention period meets the application's longevity requirements.

Real Time Clock Selection Notes

Select the DS1687-5IND when a self-contained RTC solution is needed without external crystals or batteries. Choose this over the DS1685 if board space is limited or assembly complexity must be reduced. Verify that the system design supports the multiplexed bus interface timing. Ensure the primary supply remains within 4.5V to 5.5V for full accessibility.

Real Time Clock Part Context

The DS1687 series serves as a successor to industry-standard DS1287 PC clocks, offering enhanced features like Y2K compliance and power-control circuitry. It is part of the DS1685/DS1687 family, where the DS1685 is the bare die/chip version and the DS1687 is the encapsulated module. This component integrates all necessary passive components for timekeeping into a single DIP package.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.