SM8578BV

SM8578BV Real-time Clock IC OVERVIEW The SM8578BV is a serial interface, real-time clock IC that uses a 32.768 kHz crystal oscillator for its reference 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 I I PINOUT (Top view) I I I I I I I I I 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 INTN XTN XT VSS 1 8 VDD DATA CLK 4 5 CE ORDERING INFORMATION, Device SM8578BV Package 8-pin VSOP PACKAGE DIMENSIONS (Unit: mm) 0 to 10° 4.4 ± 0.2 6.4 ± 0.3 0.585typ 1.15 ± 0.05 3.12 ± 0.3 + 0.1 0.05 0.15 − 0.22 ± 0.1 NIPPON PRECISION CIRCUITS INC.—1 0.05 ± 0.05 0.65 1.30MAX 0.5 ± 0.2 SM8578BV BLOCK DIAGRAM VDD VSS Control ...