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MCP79411-I/MS

MCHPMCP79411-I/MS

Microchip Technology
Real Time Clock (RTC) IC Clock/Calendar 64B, 1Kb I2C, 2-Wire Serial 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Active5,683 in stock
Datasheet Digi-Key Compare Prices

Overview

The MCP79411-I/MS is a feature-rich Real-Time Clock and Calendar (RTCC) that includes 64 bytes of battery-backed SRAM and 1Kb of EEPROM. It is unique for providing a pre-programmed, write-protected EUI-48 MAC address, making it ideal for networked devices requiring a globally unique identifier. The device operates over a wide voltage range of 1.8V to 5.5V and features digital trimming for high-accuracy timekeeping.

Why Choose This Part

The MCP79411 combines timekeeping, non-volatile memory, and a unique ID into a single MSOP-8 package, reducing BOM count for connected products. Its digital trimming capability allows for software-based calibration to compensate for crystal frequency drift across temperature changes.

Applications

Networked IoT Nodes
Utilizes the pre-programmed EUI-48 ID for hardware identification and MAC address assignment in Ethernet or Wi-Fi connected devices.
Power-Fail Logging
The integrated power-fail timestamp records the exact time of power loss and restoration to monitor system uptime.
Battery-Powered Instruments
Ideal for portable devices due to its ultra-low 1.2uA typical timekeeping current and low-voltage operation down to 1.8V.

Key Specifications

Type Clock/Calendar
Features Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
Interface I2C, 2-Wire Serial
Date Format YY-MM-DD-dd
Memory Size 64B, 1Kb
Time Format HH:MM:SS (12/24 hr)
Mounting Type Surface Mount
Package / Case 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Voltage - Supply 1.8V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 8-MSOP
Voltage - Supply, Battery 1.3V ~ 5.5V
Current - Timekeeping (Max) 1.2uA @ 3.3V

Getting Started

To evaluate the MCP79411, engineers can use the MCP79410 RTCC PICtail Plus Daughter Board or interface the MSOP-8 package directly via the I2C bus. Implementation requires a 32.768 kHz crystal and a backup battery (typically a CR2032 or supercapacitor) connected to the V_BAT pin for continuous timekeeping during primary power loss.

MCP7941 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
MCP79411-I/MS (this part) TSSOP-8 5,683
MCP79410T-I/SN SOIC-8 30,740
MCP79410T-I/MS TSSOP-8 9,289
Also available as: MCP79410-I/SN

Also Consider

DS3231 Maxim Integrated / Analog Devices - Provides much higher accuracy with an integrated temperature-compensated crystal oscillator (TCXO).

Categories

Clocks & Timing > Real-Time Clocks Memory & Storage > EEPROM Microcontrollers > Microchip