RTC-72421B: PURE SN,IC RTC CLK/CALENDAR PAR 18DIP
RTC-72421B: ROHS,IC RTC CLK/CALENDAR PAR 18DIP
【EPSON】RTC-72421B:ROHS,IC REAL TIME CLOCK 18-DIP
【EPSON】RTC-72423A,IC REAL TIME CLOCK 24-SOP
RTC-72423A +/-20PPM,
RTC-72423A: PURE SN,IC RTC CLK/CALENDAR PAR 24SOP
RTC-72423A: ROHS,IC RTC CLK/CALENDAR PAR 24SOP
【EPSON】RTC-72423A:2,IC REAL TIME CLOCK 24-SOP