PT7C4363BQ/PT7C4563BQ Serial Real-Time Clocks Diodes Incorporated PT7C4363BQ/PT7C4563BQ Serial Real-Time Clocks are automotive-grade low-power clocks/calendars with a programmable square-wave output. Each Diodes Incorporated device supports up to 125°C operating temperature. Address and data are transferred serially via a 2-wire bidirectional bus. The clock/calendar provides information on seconds, minutes, hours, days, dates, months, and years. The date at the end of the month is automatically adjusted for months with fewer than 31 days—including corrections for leap year. The clock operates in the 24-hour format indicator.