The MICROCHIP TECH. MCP7940NT-I/MS is a highly reliable battery-backed I2C real-time clock/calendar with 64-byte SRAM. It operates at a voltage range of 1.8 to 5.5VDC and supports both 12/24-hour time formats. With its I2C interface, it offers a convenient way to integrate real-time clock functionality into various applications. This clock/calendar is designed to withstand temperature extremes, with a temperature range of -40°C to +85°C. It comes in an 8-lead MSOP package, available in tape and reel packaging for easy handling and assembly.