Microchip Technology MCP79521-I/MS

Mfr. Part

MCP79521-I/MS

Manufacturer

Micrel / Microchip Technology

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Detailed Description

Real-Time Clock and Calendar IC with SPI interface. Battery backup for uninterrupted timekeeping. 64-byte memory, alarm, leap-year handling, square-wave output, and unique ID. Industrial temperature range -40°C to 85°C. Operates from 1.8V to 3.6V with battery supply from 1.3V to 3.6V. Compact 10-MSOP package. RoHS3 compliant. Mounting type surface mount. Base product number MCP79521. Package is Tube. Quantity available 3400.

Key Features

SPI interface for simple MCU connection

Time format HH:MM:SS:hh with 12/24-hour modes

Date format YY-MM-DD-dd with automatic month length and leap-year support

Battery backup input to maintain time during main power loss

Programmable alarm and interrupt

Square-wave output with selectable frequencies

64B on-chip memory (SRAM), EEPROM present

Unique ID for device identification

Operating temperature -40°C to 85°C

Supply voltage 1.8V to 3.6V

Battery supply 1.3V to 3.6V

RoHS3 compliant

Surface-mount 10-MSOP footprint

Key Advantages

Easy integration via SPI cuts firmware complexity

Accurate calendar with leap-year handling reduces software overhead

Battery backup ensures continuous timekeeping during outages

Low-power timekeeping suitable for battery-powered designs

Small MSOP-10 package saves PCB space

Built-in alarm and square-wave minimize external components

Unique ID supports secure tracking and pairing

Industrial temperature range makes it dependable in harsh environments

Y-IC professional sourcing and support provide dependable supply and service

Packaging

Type MSOP-10 and TFSOP-10, surface-mount

Material Molded plastic package with lead-free matte tin plated leads, RoHS3 compliant

Size 10-MSOP body width about 0.118 inch 3.00 mm

Pin configuration 10-pin package typically including SPI pins SCK SI SO CS, power pins VDD and GND, battery pin VBAT, and output pin SQW or INT refer to datasheet for exact pinout

Thermal characteristics Rated for -40°C to 85°C operation; thermal resistance values depend on PCB and layout refer to datasheet for θJA and design guidance

Electrical properties Supply voltage 1.8V to 3.6V; battery supply 1.3V to 3.6V; current for timekeeping per provided parameters 1A max; interface SPI; square-wave output available

Lifecycle

Status Active based on available information and not nearing discontinuation

Alternatives Related RTC families exist within Microchip such as MCP7941x I2C RTC series and other SPI RTC variants with similar functions feature and pin differences may apply

For a detailed list of equivalent or alternative models and second-source options please contact our sales team via the Y-IC website and we will provide a precise cross-reference and availability

Key Application Areas

Industrial controllers and data loggers for time-stamping

Smart meters and building automation with scheduled events

IoT nodes and wireless sensors with battery-backed timekeeping

Consumer electronics such as clocks, cameras, and home appliances

POS terminals and kiosks for transaction logging

Embedded systems needing unique device ID and square-wave output

Security and access control systems with alarms and timers

Datasheet

Y-IC hosts the most authoritative datasheet for MCP79521-I/MS on our product page. Download the datasheet on this page for complete specifications, pinout, timing, and application guidelines.

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