MCP79410-I/SN

Real Time Clock Overview

The MCP79410-I/SN is a battery-backed I2C Real-Time Clock/Calendar (RTCC) integrated circuit manufactured by Microchip Technology. 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 within an industrial temperature range of -40°C to +85°C and supports a supply voltage of 1.8V to 5.5V. Key electrical parameters include a typical timekeeping current of 1.2µA at 3.3V from VCC and 925nA at 3.0V from VBAT. It features 64 bytes of SRAM, 1 Kbit of EEPROM, and a multifunction output pin.

Real Time Clock Feature Summary

• Integrated RTCC with dual programmable alarms and power-fail timestamp logging
• On-chip digital trimming for oscillator calibration with ±1 ppm resolution
• 1 Kbit EEPROM with software write-protect and 64-byte battery-backed SRAM
• I2C compatible interface supporting clock rates up to 400 kHz

Real Time Clock Applications

• Electronic watches and wearable devices requiring precise timekeeping
• Data logging systems needing timestamp capture during power transitions
• Industrial equipment requiring low-power real-time tracking in harsh environments

Real Time Clock Procurement Notes

Verify the package type corresponds to the SOIC-8 specification for the -SN suffix. Confirm the industrial temperature grade (-I) matches application requirements. Ensure the specific part number MCP79410-I/SN is selected rather than variants with pre-programmed EUI addresses like the MCP79411 or MCP79412.

Real Time Clock Selection Notes

Select this component when unprogrammed protected EEPROM is required, as opposed to the MCP79411 (EUI-48) or MCP79412 (EUI-64). The SOIC-8 package is suitable for standard surface-mount assembly. Ensure external load capacitors are calculated to match the crystal's specified load capacitance of 6-9 pF for optimal frequency accuracy.

Real Time Clock Part Context

This part belongs to the MCP7941X family of battery-backed I2C RTCCs. It shares functional similarities with the MCP79411 and MCP79412 but differs in the protected EEPROM section, which remains unprogrammed in the MCP79410 variant. The -SN suffix specifically denotes the 8-lead Small Outline Integrated Circuit (SOIC) package.

Real Time Clock Replacement Considerations

MCP79410T-I/SN: Tape and reel version of the same device. MCP79411-I/SN: Identical functionality but includes pre-programmed EUI-48 MAC address in protected EEPROM. MCP79412-I/SN: Identical functionality but includes pre-programmed EUI-64 MAC address.