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, housed in a 24-pin TSSOP package. It operates within a voltage range of 2.7V to 3.7V and supports an operating temperature range of 0°C to +70°C. The device features a multiplexed address/data bus interface and includes 242 bytes of battery-backed NV SRAM. Key specifications include a maximum current consumption of 2mA at 3V, Y2K compliance, and a 64-bit silicon serial number.

Real Time Clock Feature Summary

• Integrated 242-byte non-volatile RAM with dual-bank architecture
• Y2K compliant timekeeping algorithm with leap-year compensation through 2099
• Power-control circuitry enabling system power-on via date/time alarm or key closure
• 32.768kHz square-wave output for power management activities

Real Time Clock Applications

• Embedded systems requiring precise timekeeping
• Utility meters needing long-term data retention
• Security systems with alarm logging capabilities
• Network hubs, bridges, and routers

Real Time Clock Procurement Notes

Verify the specific suffix '+T&R' confirms the tape and reel packaging format when sourcing. Confirm the 'E' designation aligns with the required TSSOP package dimensions. Ensure the '-3' suffix matches the target 3V supply voltage constraints for the application design.

Real Time Clock Selection Notes

Select this component for designs requiring a parallel multiplexed bus interface rather than serial alternatives. The 3V operation variant is suitable for low-voltage systems where VCC ranges between 2.7V and 3.7V. Consider the industrial temperature grade variants if operation below 0°C is required.

Real Time Clock Part Context

This part 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 auxiliary battery input while maintaining compatibility with existing BIOS functions.

Real Time Clock Replacement Considerations

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