MCP79411T-I/SN

Real Time Clock Overview

The MCP79411T-I/SN is a battery-backed I2C Real-Time Clock/Calendar (RTCC) in an 8-lead SOIC package. It tracks time using internal counters for hours, minutes, seconds, day of week, date, month, and year, with leap year compensation to 2399. The device operates on a supply voltage range of 1.8V to 5.5V and supports backup voltages from 1.3V to 5.5V. Key electrical parameters include a typical timekeeping current of 1.2 µA at 3.3V VCC and 925 nA at 3.0V VBAT. It features 64 bytes of battery-backed SRAM, 1 Kbit of EEPROM, and a preprogrammed 64-bit EUI-48 MAC address in protected EEPROM. The I2C interface supports clock rates up to 400 kHz.

Real Time Clock Feature Summary

• Integrated Real-Time Clock/Calendar with dual programmable alarms and power-fail timestamp logging.
• On-chip digital trimming provides ±1 ppm resolution for frequency calibration over the industrial temperature range (-40°C to +85°C).
• Includes 64-byte SRAM, 1 Kbit EEPROM, and a 64-bit protected area preprogrammed with an EUI-48 MAC address.
• Open-drain multifunction pin (MFP) configurable as alarm output, selectable frequency square wave, or general purpose output.

Real Time Clock Applications

• Systems requiring precise timekeeping with low-power battery backup capabilities.
• Devices needing unique hardware identification via preprogrammed EUI-48 addresses.
• Applications utilizing I2C communication interfaces for clock synchronization.

Real Time Clock Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape-and-reel packaging and 'SN' indicates the 8-lead SOIC package. Confirm the '-I' suffix denotes the industrial temperature range of -40°C to +85°C. Ensure the specific part number matches the required memory configuration for the EUI-48 address.

Real Time Clock Selection Notes

Select this component when an I2C RTCC with integrated nonvolatile memory and unique ID storage is required. The MCP79411 is distinguished from the MCP79410 by its preprogrammed EUI-48 address and from the MCP79412 by its 64-bit versus 64-bit EUI addressing. Consider the 1.2 µA operating current and automatic switchover features for power-sensitive designs.

Real Time Clock Part Context

This part belongs to the MCP7941X family, which includes the MCP79410, MCP79411, and MCP79412. These devices share identical functional blocks and pinouts but differ in their protected EEPROM content. The MCP79411 specifically contains a factory-programmed EUI-48 address, whereas the MCP79410 has unprogrammed protected EEPROM.

Real Time Clock Replacement Considerations

The MCP79410T-I/SN is functionally compatible but lacks the preprogrammed EUI-48 address. The MCP79412T-I/SN offers a preprogrammed EUI-64 address instead. Other packages such as MSOP or TDFN are available as pin-compatible alternatives if board space constraints require a different form factor.