DS1685Q-5+

Real Time Clock Overview

The DS1685Q-5+ is a real-time clock (RTC) and calendar IC manufactured by Analog Devices Inc./Maxim Integrated. It operates at +5V with an industrial temperature range of 0°C to +70°C. The device features a multiplexed address/data bus interface, 242 bytes of battery-backed NV RAM, and a 64-bit silicon serial number. It supports Y2K compliance, leap-year compensation through 2099, and power-on control via alarm or kickstart inputs. The component is housed in a 28-pin PLCC package.

Real Time Clock Feature Summary

• Multiplexed Address/Data Bus Interface
• 242 Bytes Battery-Backed NV RAM
• 64-Bit Silicon Serial Number
• Power-Control Circuitry for System Wake-Up

Real Time Clock Applications

• Embedded Systems
• Utility Meters
• Security Systems
• Network Hubs, Bridges, and Routers

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm lead-free/RoHS compliance status and exact temperature grade. Confirm package type availability as distribution channels may vary between standard and tape-and-reel options.

Real Time Clock Selection Notes

Select this model for systems requiring a +5V supply and a 28-pin PLCC footprint. Ensure the design accommodates the multiplexed bus timing requirements. Verify that the external crystal load capacitance matches the selected CS bit configuration in Extended Control Register 4B.

Real Time Clock Part Context

This part belongs to the DS1685/DS1687 series of 3V/5V Real-Time Clocks. It serves as a successor to industry-standard PC clocks like the DS1287, offering enhanced features such as auxiliary battery inputs and RAM clear functions while maintaining BIOS compatibility.

Real Time Clock Replacement Considerations

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