DS1685E-5+

Real Time Clock Overview

The DS1685E-5+ is a real-time clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 24-pin TSSOP package. It operates within a voltage range of 4.5V to 5.5V and supports an industrial temperature range of -40°C to +85°C. The device features a multiplexed address/data bus interface and provides 242 bytes of battery-backed non-volatile RAM. Key functions include calendar and timekeeping with leap-year compensation through 2099, date alarms, and power-control circuitry for system wake-up capabilities.

Real Time Clock Feature Summary

• Multiplexed bidirectional address/data bus interface
• 242 bytes of user-accessible non-volatile SRAM
• Integrated 32kHz square-wave output for power management
• Power-on control via external kickstart or date/time alarm

Real Time Clock Applications

• Embedded systems requiring precise timekeeping
• Utility meters with data retention needs
• Security systems with alarm logging
• Network hubs, bridges, and routers

Real Time Clock Procurement Notes

Verify the specific suffix 'E' confirms the TSSOP-24 package variant. Confirm the '-5' suffix indicates the 5V operating voltage range (4.5V to 5.5V). Ensure the '+'' denotes lead-free/RoHS compliance as per manufacturer standards. Cross-reference the full part number against current distributor listings to confirm availability status.

Real Time Clock Selection Notes

Select this component when a multiplexed parallel interface is required rather than serial alternatives like the DS1673. Choose the E suffix for surface-mount TSSOP packaging compatibility. The -5 voltage rating is suitable for standard 5V logic systems; use the -3 variant if the design operates strictly at 3V. Verify that the 242-byte RAM capacity meets the application's non-volatile storage requirements.

Real Time Clock Part Context

This part belongs to the DS1685/DS1687 series, designed as successors to industry-standard PC clocks like the DS1287. It integrates enhanced features such as a silicon serial number and auxiliary battery input compared to earlier generations. The E suffix specifically identifies the TSSOP package version within the broader DS1685 family.

Real Time Clock Replacement Considerations

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