www.DataSheet4U.com Real time clock module 4-bit .
RTC-7301DG - (RTC-7301DG/SF) 4-bit REAL TIME CLOCK MODULE
RTC-7301SF - (RTC-7301DG/SF) 4-bit REAL TIME CLOCK MODULE
RTC7301SF - (RTC-7301DG/SF) 4-bit REAL TIME CLOCK MODULE