DS1685E-3+T&R

Real Time Clock Overview

The DS1685E-3+T&R is a real-time clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated. It operates within a voltage range of 2.7V to 3.7V and supports a temperature range of 0°C to +70°C. The device features a multiplexed address/data bus interface and provides 242 bytes of battery-backed NVSRAM. Key specifications include a 32kHz square-wave output, Y2K compliance, and a 64-bit silicon serial number. It is housed in a 24-pin TSSOP package with a tape and reel configuration.

Real Time Clock Feature Summary

• Multiplexed bidirectional address/data bus interface
• 242 bytes of battery-backed nonvolatile RAM
• Y2K compliant timekeeping algorithm with leap-year compensation through 2099
• Integrated 64-bit silicon serial number

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the component matches the specific 3V operating voltage and 0°C to +70°C temperature grade. Confirm the 24-pin TSSOP package and tape and reel packaging format align with assembly requirements. Ensure the auxiliary battery input and kickstart functionality are supported by the system design if these features are utilized.

Real Time Clock Selection Notes

Select this part for applications requiring direct replacement for industry-standard DS1287 PC clocks with enhanced features. Choose the DS1685E-3 variant specifically for 3V primary power supply designs. Consider the DS1685EN series if an industrial temperature range (-40°C to +85°C) is required instead of the commercial grade.

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 earlier models like the DS1285 and DS1385. The 'E' suffix denotes the TSSOP package, while the '-3' indicates the 3V operation variant. The '+T&R' suffix specifies lead-free/RoHS compliance and tape and reel packaging.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers: DS1685S-5+, DS1685E-5+, DS1685Q-3+. Verify pin compatibility and voltage levels when replacing with other variants in the DS1685 family.