DS1689SN

Real Time Clock Overview

The DS1689SN is a serialized real-time clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated. It operates within a voltage range of 2.7V to 3.3V or 4.5V to 5.5V, with battery backup support between 2.5V and 3.7V. The device features a multiplexed parallel interface and includes 114 bytes of nonvolatile RAM. It provides timekeeping in HH:MM:SS and YY-MM-DD-dd formats, supporting both 12-hour and 24-hour modes. The component is housed in a 28-SOIC package and functions reliably across an industrial temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Incorporates a unique 64-bit silicon serial number and optional 64-bit customer-specific ROM for system identification.
• Includes power control circuitry enabling system power-on via date/time alarms or kickstart inputs.
• Features automatic battery backup and write protection for external SRAM through VCCO and CEO pins.
• Provides multiple interrupt sources including alarm, periodic, update-ended, wake-up, kickstart, and RAM clear.

Real Time Clock Applications

• PC clock/calendar systems requiring industry-standard compatibility.
• Industrial equipment needing elapsed time and power cycle counters.
• Systems utilizing wake-up alarms or kickstart functionality for power management.

Real Time Clock Procurement Notes

Verify the specific ordering suffix to confirm the operating temperature range. The 'N' suffix indicates the industrial version (-40°C to +85°C), while other suffixes may denote commercial ranges. Confirm RoHS compliance status based on the '+' designation in the part number. Check current availability as this component may be subject to discontinuation.

Real Time Clock Selection Notes

Select the DS1689SN for applications requiring industrial temperature stability (-40°C to +85°C). Ensure the design supports the required 28-SOIC footprint and multiplexed parallel bus interface. Verify that the system voltage aligns with the 3V or 5V operation modes. Consider the need for auxiliary battery input if kickstart or extended square-wave output features are utilized.

Real Time Clock Part Context

The DS1689SN belongs to the DS1689/DS1693 family of serialized real-time clocks. It serves as a successor to earlier models like the DS1287, offering enhanced features such as NVSRAM control and power management capabilities. The 'SN' variant specifically denotes the industrial temperature grade within the SOIC package lineup.

Real Time Clock Replacement Considerations

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