RV-8263-C7 Real-Time Clock Modules Micro Crystal RV-8263-C7 Real-Time Clock Modules are SMT real-time clock modules that incorporate an integrated CMOS circuit together with an XTAL. These real-time clock modules come with an I2C bus and operate under vacuum in a hermetically sealed ceramic package with a metallic lid. Typical applications include IoT, metering, industrial, automotive, healthcare, wearables, and portables.