{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS1685S-3+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"DS1685S-3","canonicalUrl":"https://icboms.com/analog-devices/DS1685S-3","factsUrl":"https://icboms.com/api/mcp/products/DS1685S-3%2B","rawCanonicalId":null},"summary":{"shortDescription":"Maxim Integrated DS1685S-3+, Clock/Calendar RTC, Parallel Interface, 242B NVSRAM, Alarm / Square Wave Output / Y2K, 2.7V–3.7V Supply, 0°C–70°C, 24-SOIC (0.295\", 7.50mm Width), Tube.","salesMarkdown":"## What the DS1685S-3+ is and where it fits The Maxim Integrated DS1685S-3+ is a parallel-interface real-time clock (RTC) that keeps calendar and time data in YY-MM-DD-dd and HH:MM:SS (12/24 hr) formats. It integrates 242 bytes of nonvolatile SRAM (NVSRAM) for user data that survives a main power loss, plus an alarm comparator and a programmable square-wave output. The part operates from a 2.7V to 3.7V main supply and draws a maximum of 2mA during timekeeping at 3V; a separate battery supply pin (2.5V to 3.7V) maintains the clock and NVSRAM when the main rail drops. The 0°C to 70°C temperature grade suits commercial equipment — office peripherals, point-of-sale terminals, embedded controllers, and instrumentation panels that need a battery-backed timestamp and small data store. ## Parallel interface and memory — what 242B NVSRAM means for the BOM The parallel bus gives deterministic read/write timing for a host microcontroller that already has a parallel memory controller or GPIO bank. The 242-byte NVSRAM is not a general-purpose replacement for a serial EEPROM — it is sized for calibration constants, last-logged event timestamps, or configuration bytes that must be retained across power cycles without a separate nonvolatile memory IC. If your firmware needs more than 242 bytes of battery-backed storage, you either add an external serial SRAM or step to a larger RTC in the same family. ## Alarm, square-wave output, and Y2K compliance The alarm output can trigger a time-of-day event without polling the clock registers. The square-wave output provides a hardware tick at a programmable frequency. Y2K compliance means the century rollover is handled internally. ## Package and assembly The 24-SOIC wide-body (0.295\" body width, 7.50 mm) is a standard surface-mount footprint shared by many RTCs and parallel-interface peripherals. The tube shipping medium is typical for prototype and low-volume builds; for reel quantities, verify the distributor's packaging options at quote time.","metaTitle":"DS1685S-3+ Real Time Clock, Parallel Interface, 242B NVSRAM","metaDescription":"Maxim DS1685S-3+ RTC Clock/Calendar with 242B NVSRAM, parallel interface, alarm, square wave output. 2.7V–3.7V supply, 0°C–70°C. Active, RoHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Clock/Calendar","Package":"Tube","Features":"Alarm, NVSRAM, Square Wave Output, Y2K","Interface":"Parallel","Date Format":"YY-MM-DD-dd","Memory Size":"242B","Time Format":"HH:MM:SS (12/24 hr)","Mounting Type":"Surface Mount","Package / Case":"24-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.7V ~ 3.7V","Operating Temperature":"0°C ~ 70°C","Supplier Device Package":"24-SOIC","Voltage - Supply, Battery":"2.5V ~ 3.7V","Current - Timekeeping (Max)":"2mA @ 3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8.39","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$8.39000","currency":"USD"},{"qty":10,"price":"$7.57900","currency":"USD"},{"qty":25,"price":"$7.22600","currency":"USD"},{"qty":100,"price":"$6.27430","currency":"USD"},{"qty":250,"price":"$5.99232","currency":"USD"},{"qty":500,"price":"$5.46360","currency":"USD"},{"qty":1000,"price":"$4.75862","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/DS1685-DS1687.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does the DS1685S-3+ work with a 3.3V supply?","answer":"Yes. The main supply range is 2.7V to 3.7V, which covers a nominal 3.3V rail. The battery backup supply pin accepts 2.5V to 3.7V."},{"question":"What is the DS1685S-3+ equivalent or replacement?","answer":"Maxim's DS1685 family includes multiple density and package options. For a pin-compatible alternate, check the DS1685S-3 (non-3V variant) or DS1685S-5 (5V version) — verify the supply voltage and temperature grade against your BOM before substituting. No single direct replacement is listed in the official cross-reference; confirm fit with the datasheet."},{"question":"What is the DS1685S-3+ real time clock?","answer":"It is a parallel-interface real-time clock/calendar IC from Maxim Integrated that tracks time in HH:MM:SS (12/24 hr) and date in YY-MM-DD-dd format, with 242 bytes of NVSRAM, an alarm, a square-wave output, and Y2K compliance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/DS1685S-3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/DS1685S-3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}