OVERVIEW
The SM8578BV is a serial interface, real-time clock IC that uses a 32.768 kHz crystal oscillator for its refer ence timing. It comprises second-counter to year-counter clock and calendar circuits that feature automatic leap-year adjustment, alarm and timer interrupt functions, as well as oscillator stop, timer reloading, and other detection functions. Data is transferred to and from an external controller using a 3-wire serial interface. It is available in compact 8-pin VSOP packages, making it ideal for use in all types of portable, hand-held equipment.

FEATURES
■ 1.6 to 5.5V wide operating voltage range
■ 0.5µA (typ.) current consumption (VDD = 3.0V, CE = Low)
■ 3-wire serial interface control
■ Day, day-of-week, hour, and minute alarm interrupt function
■ 1/4096 seconds to 255 minutes presettable interval timer interrupt function
■ Time update detection function
■ Abnormal oscillation detection function
■ Automatic leap-year adjustment function (Western and Japanese calendars)
■ Oscillator capacitor CD built-in
■ Molybdenum-gate CMOS process
■ Miniature 8-pin VSOP package