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Manufacturer Part #


MCP79410 Series 5.5 V I2C™ Real-Time Clock/Calendar with EEPROM SRAM-SOIC-8

Mfr. Name: Microchip
Standard Pkg:
Product Variant Information section
Date Code: 1846
Product Specification Section
Technical Attributes
Attributes Table
Date Format: DW:DM:M:Y
Time Format: HH:MM:SS
Interface: I2C
Non-Volatile Memory Size: 1kB
SRAM 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 MCP79410 series general purpose I2C™Compatible real-time clock/calendar (RTCC) is highly integrated with nonvolatile memory and advanced features normally found in higher priced devices. These features include a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy.

Using a low-cost 32.768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies. In addition, non-volatile memory is included along with a Unique ID in a locked section of EEPROM that can be unlocked and programmed by the End User.   


  • Low Power Operation
    • VCC Min = 1.8 V
    • Icc < 5 μA Typical Dynamic Current
  • Low Backup Power
    • VBAT Min = 1.3 V
    • Ibat < 700 nA 'Typical Timekeeping & SRAM Retention Current
  • Automatic Battery Switchover with Timestamp
    • VCC to VBAT '(Power lost)
    • VBAT to VCC '(Power restored)
  • Dual alarms with single IRQ Output that operates on VCC or VBAT
  • Clock Out frequencies of 32.768, 8.192 & 4.096 KHz and 1 Hz
  • Digital Trimming Range from -127 to +127ppm in 1ppm steps
    • 1 ppm is approximately 86 milliseconds/day
  • EEPROM has 8 Bytes/Page with Block Sector write protection
    • Protect none, 1/4, 1/2 or all of array
  • Factory standard or custom ID programming available
Pricing Section
Minimum Order:
Multiple Of:
Factory Stock:Factory Stock:
Factory Lead Time:
12 Weeks
Web Price
Product Variant Information section