DS1685E-3+

Real Time Clock Overview

The DS1685E-3+ is a real-time clock (RTC) manufactured by Analog Devices Inc./Maxim Integrated, housed in a 24-pin TSSOP package. It operates within a voltage range of 2.7V to 3.7V and supports an industrial temperature range of 0°C to +70°C. The device features a multiplexed address/data bus interface and provides 242 bytes of battery-backed non-volatile RAM. Key functionalities include Y2K-compliant timekeeping with leap-year compensation through 2099, a 64-bit silicon serial number, and power-control circuitry for system wake-up via alarm or key closure.

Real Time Clock Feature Summary

• Multiplexed bidirectional address/data bus interface for standard PC clock compatibility
• 242 bytes of user-accessible non-volatile SRAM divided into two banks
• Integrated power-control circuitry enabling system power-on via date/time alarm or kickstart input
• Y2K compliant calendar with automatic leap-year compensation valid through 2099

Real Time Clock Applications

• Embedded systems requiring precise timekeeping
• Utility meters needing non-volatile data retention
• Security systems with alarm-based wake-up capabilities
• Network hubs, bridges, and routers

Real Time Clock Procurement Notes

Verify the specific suffix 'E' confirms the TSSOP-24 package and '-3+' indicates the +3V operating voltage with lead-free/RoHS compliance. Confirm the temperature grade matches the application requirements, as other variants exist for extended industrial ranges. Ensure the source document explicitly lists this part number to avoid confusion with similar DIP or PLCC packages.

Real Time Clock Selection Notes

Select the DS1685E-3+ when a surface-mount TSSOP-24 package is required for +3V operation within the 0°C to +70°C commercial temperature range. Choose this variant over the -5+ models if the primary supply voltage is strictly regulated at 3V. Consider the EN-3+ variant if an extended industrial temperature range (-40°C to +85°C) is necessary for the deployment environment.

Real Time Clock Part Context

This component belongs to the DS1685/DS1687 family of 3V/5V Real-Time Clocks, designed as successors to industry-standard DS1287 PC clocks. The 'E' designation specifically identifies the Thin-Shrink Small Outline Package (TSSOP), distinguishing it from the PDIP, SO, or PLCC packages available in the same functional family.

Real Time Clock Replacement Considerations

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