DS1689S+

$5.34

Description：IC RTC CLK/CALENDAR PAR 28SOIC
Series：-

SKU:ce39e74871b6 Category: Real Time Clocks Brand: Analog Devices Inc./Maxim Integrated

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Product introduction

DS1689S+ is listed in the Real Time Clock range at ChipApex. The manufacturer field lists Analog Devices Inc./Maxim Integrated. Its product description is IC RTC CLK/CALENDAR PAR 28SOIC. Review the specifications below when checking this part for your BOM.

Real Time Clock specifications for DS1689S+

Description：IC RTC CLK/CALENDAR PAR 28SOIC
Series：-
Package：Tube
Mfr：Analog Devices Inc./Maxim Integrated
Type：Clock/Calendar
Features：NVSRAM
Memory Size：114B
Time Format：HH:MM:SS (12/24 hr)
Date Format：YY-MM-DD-dd
Interface：Parallel
Voltage - Supply：2.7V ~ 3.3V, 4.5V ~ 5.5V
Voltage - Supply, Battery：2.5V ~ 3.7V
Current - Timekeeping (Max)：2mA @ 3V, 3mA @ 5V
Operating Temperature：0°C ~ 70°C
Mounting Type：Surface Mount
Grade：-
Qualification：-
Package / Case：28-SOIC (0.337", 8.56mm Width)
Supplier Device Package：28-SOIC

Real Time Clock datasheet and documents for DS1689S+

DS1689S+

Real Time Clock Overview

The DS1689S+ is a serialized real-time clock (RTC) IC designed for +3V or +5V operation in a 28-pin SOIC package. It features a 64-bit silicon serial number and an additional 64-bit customer-specific ROM. The device includes 114 bytes of user-accessible nonvolatile RAM, automatic battery backup switching to VBAT or VBAUX, and write protection during power failures. Timekeeping supports leap year compensation through 2100 with formats including YY-MM-DD-dd and HH:MM:SS. It provides multiple interrupt sources, a square-wave output, and elapsed time counters.

Real Time Clock Feature Summary

Incorporates a unique 64-bit silicon serial number and optional 64-bit customer ROM.
Provides 114 bytes of general-purpose nonvolatile RAM with automatic backup and write protection.
Supports system power-on via date/time alarm or kickstart input using the PWR pin.
Includes 32-bit elapsed time counters powered by VCC and VBAT, plus a 16-bit power cycle counter.

Real Time Clock Applications

Portable system controllers requiring persistent timekeeping and memory.
Industrial systems needing maintenance tracking via elapsed time and power cycle counters.
Network nodes utilizing the serial number for electronic identification.

Real Time Clock Procurement Notes

Verify component status as discontinued products may be subject to obsolescence. Confirm that the specific ordering suffix corresponds to the required temperature range and packaging format. Ensure auxiliary battery voltage requirements are met for kickstart functionality.

Real Time Clock Selection Notes

Select the DS1689SN+ variant for industrial temperature ranges (-40°C to +85°C). Ensure crystal selection matches the specified load capacitance (6pF or 12.5pF) and configure the CS bit accordingly. Verify VCCI voltage levels to determine if autosense mode or fixed 5V operation is appropriate.

Real Time Clock Part Context

The DS1689S+ belongs to the DS1689/DS1693 family of serialized RTCs. It serves as a successor to industry-standard PC clocks like the DS1287, offering enhanced features such as NV SRAM control and power management while maintaining BIOS compatibility.