Vishay U310 is a type of real-time clock chip that is used in computers, embedded systems, and other digital electronics. It is an 8-pin chip that features a user-programmable serial bus interface, battery backup, and three programmable alarms. It also has an internal crystal oscillator and can keep track of hours, minutes, days, and months. The U310 can work with both 5V and 3V power supplies, and it is designed to offer a low power consumption and a high accuracy in keeping time.