The MCP79511-I/MS from Microchip Technology is a real-time clock (RTC) Integrated Circuit with clock/calendar functions, a 64B SPI interface and a 10-MSOP package (0.118" / 3.00 mm width).
The MCP79511T-I/MN from Microchip Technology is a real-time clock (RTC) Integrated Circuit with a calendar, 64 B of memory and an SPI interface, in a 10-WFDFN exposed-pad package.
The MCP79511T-I/MS from Microchip Technology is a real-time clock Integrated Circuit with calendar function and an SPI interface, in a 10-MSOP package.