Analog Devices Inc./Maxim Integrated DS1284QN+

Mfr. Part

DS1284QN+

Manufacturer

Analog Devices Maxim Integrated

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Detailed Description

Real-time clock and calendar IC with a parallel interface and on-chip user SRAM. Works from 4.5 V to 5.5 V with battery backup from 2.4 V to 3.5 V. 28‑pin PLCC J‑lead surface‑mount package. Industrial temperature range. Functions include alarm, leap‑year correction, square‑wave output, watchdog timer, and 50‑byte user SRAM. Time formats 12 or 24 hour with hundredths. Date format year, month, day of month, day of week. RoHS3 compliant.

Key Features

Clock and calendar with 12 or 24 hour format and hundredths of seconds

Full date keeping with automatic leap‑year adjustment

Parallel bus interface for fast, simple processor connection

Alarm function and programmable square‑wave output

Watchdog timer for system supervision

50‑byte user SRAM for nonvolatile storage

Battery backup input for timekeeping during power loss

Wide operating temperature range −40 to +85 °C

RoHS3 compliant lead‑free version

Surface‑mount 28‑PLCC J‑lead package

Base product family DS1284

Key Advantages

Integrated alarm, watchdog, and SRAM reduce extra components and board space

Parallel interface eases use with legacy and industrial systems that expect a memory‑mapped RTC

Battery backup maintains time through power interruptions for higher system reliability

Industrial temperature rating supports harsh environments

Mature, proven device for long‑lived platforms and equipment

Packaging

Package type 28‑PLCC with J‑leads also noted as 28‑LCC J‑lead

Material molded plastic epoxy body with tin‑finished J‑leads

Size body 11.51 mm x 11.51 mm nominal per PLCC standard

Height standard PLCC profile typical height per JEDEC; see datasheet for exact dimension

Pin configuration 28 perimeter J‑leads with parallel address, data, and control pins; see datasheet pinout for mapping

Mounting surface mount suitable for reflow

Thermal characteristics operating temperature −40 to +85 °C; thermal resistance depends on board and airflow; see datasheet and follow good PCB copper and airflow practices

Electrical properties VCC 4.5 V to 5.5 V, VBAT 2.4 V to 3.5 V, timekeeping current up to 7 mA at 5 V max per provided spec, CMOS TTL compatible logic levels on bus, square‑wave output available

Delivery form tube

Lifecycle

Status mature product class; availability can be limited in some regions and revisions. It may be not recommended for new designs. Check with Y-IC for current stocking and factory status.

Direct equivalents same base family and package may include DS1284Q or DS1284QN lead finish or temp variants. Availability varies by region and lifecycle.

Alternative models if form fit function flexibility exists

- Parallel bus RTC families DS1286, DS12885, DS12887, DS12887A, DS12C887 note different pinouts and features

- SPI RTC DS1305, DS3234 note serial interface

- I2C RTC DS1307, DS1337, DS3231 high accuracy TCXO note serial interface

- Microprocessor supervisor RTC combos in the Maxim and Analog Devices portfolio

If you need exact drop‑in guidance or a vetted cross list contact our sales team on the Y-IC website. We will help verify fit, pinout, firmware impact, and availability.

Key Application Areas

Industrial controllers and PLCs that require a memory‑mapped parallel RTC

Legacy embedded systems and single‑board computers with parallel bus

Telecom and networking equipment needing battery‑backed timekeeping

Data loggers and event time‑stamping

Power systems and UPS with time scheduling and watchdog supervision

Test and measurement equipment with alarms and periodic interrupts

Any system that needs a rugged, battery‑backed RTC with alarm and watchdog

Datasheet

Y-IC hosts the most authoritative datasheet for DS1284QN+ on our product page. We recommend downloading it here to confirm pinout, timing, electrical limits, and exact mechanical dimensions.

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