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Manufacturer Part #


MCP79400 Series 5.5 V 64 byte SMT I2C™ Real-Time Clock/Calendar - SOIC-8

ECAD Model:
Mfr. Name: Microchip
Standard Pkg:
Product Variant Information section
Date Code:
Product Specification Section
Technical Attributes
Attributes Table
Date Format: DW:DM:M:Y
Time Format: HH:MM:SS
Interface: I2C
Non-Volatile Memory Size: 64B
Supply Voltage-Nom: 1.8V to 5.5V
Temperature Grade: Industrial
Operating Temp Range: -40°C to +85°C
Storage Temperature Range: -65°C to +150°C
Package Style:  SOIC-8
Mounting Method: Surface Mount
Features & Applications
The MCP79400T-I/SN is a I2C Real-Time Clock/Calender with highly integrated features of 64 byte of SRAM, Unique ID and a Battery Switchover Circuit, available in surface mount SOIC-8 package.

The clock/calender automatically adjusts for months with fewer than 31 days, including corrections for leap years and low-cost 32.768 kHz crystal is used to track the time.


  • Real-Time Clock/Calendar (RTCC), Battery Backed:
    • Hours, Minutes, Seconds, Day of Week, Day, Month and Year
    • Dual alarm with single output
  • On-Chip Digital Trimming/Calibration:
    • Range -127 to +127 ppm
    • Resolution 1 ppm
  • Programmable Open-Drain Output Control:
    • CLKOUT with 4 selectable frequencies
    • Alarm output
  • 64-Bit Unique ID:
    • User or factory programmable
    • Protected EEPROM
    • EUI-48™ or EUI-64™ MAC address
    • Custom ID programming
  • Automatic VCC Switchover to VBAT Backup Supply
  • Power-Fail Time-Stamp for Battery Switchover
  • Low-Power CMOS Technology:
    • Dynamic Current: 400 µA max read
    • Dynamic Current: 400 µA max SRAM
    • Battery Backup Current: <700nA @ 1.8V
  • 100 kHz and 400 kHz Compatibility
  • ESD Protection >4,000V
  • 1 Million Erase/Write Cycles for Unique ID
  • Packages include 8-Lead SOIC, TSSOP, 2x3 TDFN, MSOP
  • Pb-Free and RoHS Compliant
  • Temperature Ranges:
    • Industrial (I): -40°C to +85°C
Pricing Section
Global Stock:
Factory Stock:Factory Stock:
Factory Lead Time:
52 Weeks
Minimum Order:
Multiple Of:
Web Price
Product Variant Information section