MCP79410T-I/SN

Real Time Clock Overview

The MCP79410T-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 through 2399. The device operates on a primary supply of 1.8V to 5.5V and a backup supply of 1.3V to 5.5V. Typical timekeeping current is 1.2 µA at 3.3V VCC and 925 nA at 3.0V VBAT. It includes 64 bytes of battery-backed SRAM, 1 Kbit of EEPROM, and an unprogrammed 64-bit protected EEPROM area. The I2C interface supports clock rates up to 400 kHz.

Real Time Clock Feature Summary

• Real-Time Clock/Calendar with dual alarms and power-fail timestamp logging
• On-chip digital trimming with ±1 ppm resolution and ±129 ppm range
• Integrated 1 Kbit EEPROM and 64-byte SRAM with software write protection
• Open-drain multifunction pin configurable as alarm output, square wave generator, or general purpose output

Real Time Clock Applications

• Battery-powered portable electronics requiring accurate timekeeping
• Data logging systems utilizing power-fail timestamps
• Embedded devices needing non-volatile storage for configuration data via EEPROM

Real Time Clock Procurement Notes

Verify the 'I' suffix indicates the industrial temperature range (-40°C to +85°C) and 'SN' denotes the 8-lead SOIC package. Confirm the 'T' suffix corresponds to tape and reel packaging if required by assembly equipment. Ensure the specific part number matches the MCP79410 variant, which features unprogrammed protected EEPROM, distinct from the EUI-addressed MCP79411 or MCP79412 models.

Real Time Clock Selection Notes

Select this component when an I2C-compatible RTCC with integrated non-volatile memory is required. The MCP79410 is suitable for applications needing user-programmable unique IDs or MAC addresses within the protected EEPROM section. Consider the MCP79411 or MCP79412 if factory-programmed EUI-48 or EUI-64 addresses are preferred over custom programming.

Real Time Clock Part Context

This part belongs to the MCP7941X family of battery-backed RTCCs. The MCP79410 specifically provides unprogrammed protected EEPROM, allowing users to define their own unique identifiers. It shares the same pinout and core functionality with the MCP79411 and MCP79412, differing primarily in the pre-programming status of the protected memory block.

Real Time Clock Replacement Considerations

The MCP79411 and MCP79412 are pin-compatible replacements but come with pre-programmed EUI-48 and EUI-64 addresses respectively. Verify that the pre-programmed addresses do not conflict with network requirements before substituting.