MCP79511-I/MS

Real Time Clock Overview

The MCP79511-I/MS is a battery-backed SPI Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology. It operates within an industrial temperature range of -40°C to +85°C and supports a supply voltage of 1.8V to 3.6V. The device integrates 64 bytes of SRAM, 1 Kbit of EEPROM, and a 128-bit protected area preprogrammed with an EUI-48 MAC address. Timekeeping features include automatic leap year compensation through 2399, dual programmable alarms, and on-chip digital trimming for oscillator calibration.

Real Time Clock Feature Summary

• Integrated 128-bit Protected EEPROM Area containing a factory-programmed EUI-48™ MAC address
• On-Chip Digital Trimming with ±1 ppm resolution and ±259 ppm range for frequency adjustment
• Dual Programmable Alarms with flexible comparison options across time counters
• Power-Fail Timestamp Module that logs time during switchover to and from backup mode

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and data retention
• IoT devices utilizing the integrated EUI-48 address for network identification
• Embedded controllers needing low-power RTC functionality with SPI interface

Real Time Clock Procurement Notes

Verify the specific ordering suffix '-I/MS' confirms the Industrial temperature grade (-40°C to +85°C) and MSOP-10 package. Ensure the '11' variant designation is selected to obtain the device with the preprogrammed EUI-48™ MAC address in the protected EEPROM block.

Real Time Clock Selection Notes

Select this component when an EUI-48™ identifier is required directly within the RTC memory space. Compare against the MCP79510 if a blank protected area is acceptable, or the MCP79512 if an EUI-64™ address is needed instead. Confirm system power rails support the 1.8V to 3.6V operating range.

Real Time Clock Part Context

This part belongs to the MCP795XX family of battery-backed RTCCs. It shares the same pinout and core functionality as the MCP79510 and MCP79512, differentiated primarily by the content of the protected EEPROM block. The 'I' suffix denotes the industrial temperature rating, while '/MS' indicates the 10-lead MSOP package.

Real Time Clock Replacement Considerations

The MCP79510 serves as a functional substitute if the EUI-48™ address is not required. The MCP79512 is an alternative if an EUI-64™ address is preferred. Verify that any replacement maintains the SPI interface compatibility and MSOP-10 footprint.