DS1685S-3+T&R

Real Time Clock Overview

The DS1685S-3+T&R is a real-time clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a voltage range of 2.7V to 3.7V and features a multiplexed parallel interface. The device provides timekeeping with a calendar function, supporting both 12-hour and 24-hour formats, and includes date alarm capabilities. It incorporates 242 bytes of battery-backed non-volatile SRAM. Key specifications include a maximum timing current of 2mA at 3V, an operating temperature range of 0°C to +70°C, and a 24-pin SOIC package.

Real Time Clock Feature Summary

• Y2K compliant with leap-year compensation valid through 2099
• Includes 242 bytes of battery-backed NVSRAM
• Supports system power-on via date/time alarm or key closure
• Provides a 32kHz square-wave output for power management

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the component status as active. Confirm the package type is 24-SOIC with a width of 0.295 inches (7.50mm). Ensure the ordering suffix T&R corresponds to the tape and reel packaging format. Check RoHS compliance status, indicated by the '+' in the part number.

Real Time Clock Selection Notes

Select this model for applications requiring a 3V supply and parallel bus interface. Compare against the DS1685S-5+ variant if a 5V supply is necessary. Consider the DS1685EN-3+T&R if an industrial temperature range (-40°C to +85°C) is required instead of the commercial range.

Real Time Clock Part Context

This component belongs to the DS1685/DS1687 family of 3V/5V Real-Time Clocks. It serves as a successor to industry-standard PC clocks like the DS1287, offering enhanced features such as a silicon serial number and power-control circuitry while maintaining compatibility with existing BIOS functions.

Real Time Clock Replacement Considerations

Public confirmed substitute: DS1685S-5+