{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS1501YZN+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"DS1501YZN","canonicalUrl":"https://icboms.com/analog-devices/DS1501YZN","factsUrl":"https://icboms.com/api/mcp/products/DS1501YZN%2B","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices DS1501YZN+ Clock/Calendar RTC, Parallel Interface, 256B NVSRAM, Alarm, Leap Year, Watchdog Timer, Y2K, 28-SOIC (7.50mm), Tube.","salesMarkdown":"## Active-production RTC with integrated NVSRAM and watchdog The DS1501YZN+: Beyond basic timekeeping, the part integrates 256 bytes of non-volatile SRAM (NVSRAM), a programmable alarm, a watchdog timer, a square-wave output, and leap-year compensation through 2099. The Y2K compliance means the century rollover is handled in hardware. ## Parallel interface and timekeeping formats Communication with the host microcontroller uses a parallel interface — the time and calendar data are read and written through an 8-bit data bus with address and control strobes. The date format is YY-MM-DD-dd and the time format is HH:MM:SS in 24-hour mode. For a system architect, the parallel bus means the RTC occupies a memory-mapped or I/O-mapped address space on the host processor, with typical access times in the hundreds of nanoseconds. No serial protocol translation is needed, but the bus consumes more GPIO than an I²C or SPI RTC. ## Dual-supply architecture and power budget On the PCB, the battery input (VBAT) should be connected to a coin cell or supercapacitor through a blocking diode to prevent charging. The 5 mA timekeeping current is the worst-case figure; typical draw is lower, but the power budget for the always-on rail should accommodate this peak. ## RoHS compliance and regulatory status The DS1501YZN+ is ROHS3 compliant, meeting the European Union's Restriction of Hazardous Substances directive for the ten restricted substances.","metaTitle":"DS1501YZN+ RTC Clock/Calendar, Parallel, 256B NVSRAM","metaDescription":"Analog Devices DS1501YZN+ RTC Clock/Calendar with Alarm, Leap Year, NVSRAM, Watchdog Timer. Active production, ROHS3 compliant. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Type":"Clock/Calendar","Package":"Tube","Features":"Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K","Interface":"Parallel","Date Format":"YY-MM-DD-dd","Memory Size":"256B","Time Format":"HH:MM:SS (24 hr)","Mounting Type":"Surface Mount","Package / Case":"28-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"28-SOIC","Voltage - Supply, Battery":"2.5V ~ 3.7V","Current - Timekeeping (Max)":"5mA @ 4.5V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$14.95","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$14.95000","currency":"USD"},{"qty":10,"price":"$13.74300","currency":"USD"},{"qty":25,"price":"$13.17280","currency":"USD"},{"qty":100,"price":"$11.60640","currency":"USD"},{"qty":250,"price":"$11.03676","currency":"USD"},{"qty":500,"price":"$10.32472","currency":"USD"},{"qty":1000,"price":"$9.47026","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the DS1501YZN+ used for?","answer":"The DS1501YZN+ is a real-time clock (RTC) with calendar functions, used to maintain accurate time and date in embedded systems. It also provides 256 bytes of non-volatile SRAM for storing configuration data or event logs, a programmable alarm, a watchdog timer, and a square-wave output."},{"question":"What package does the DS1501YZN+ come in?","answer":"It ships in tube packaging."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/DS1501YZN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/DS1501YZN when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}