Real Time Clocks

Real Time Clocks (RTCs) provide time and/or date information in almost any electronic device which needs to keep accurate time. The clock types are binary counter, clock/calendar/supervisor, elapsed time counter, phantom time chip, portable system controller, temperature recorder, time event recorder, and timer clock peripheral.  They contain memory sizes ranging from 2 B to 2 MB and have interface options of I2C, Parallel, Serial, SPI, 1-Wire, 2-Wire, 3-Wire, and 4-Wire.

Part Number Manufacturer Description Quantity Price Option
DS1308U-33+ Maxim Integrated IC RTC CLK/CALENDAR I2C 8-UMAX 4103 $4.01
DS1339AU+ Maxim Integrated IC RTC CLK/CALENDAR I2C 8-USOP 9580 $3.93
DS1394U-33+ Maxim Integrated IC RTC CLK/CALENDAR SPI 10-MSOP 2896 $3.88
DS1374U-33+ Maxim Integrated IC RTC BINARY CNT I2C 10-USOP 6394 $3.78
M41ST85WMX6TR STMicroelectronics IC RTC CLK/CALENDAR I2C 28-SOIC 2532 $0.00
DS1338Z-33+ Maxim Integrated IC RTC CLK/CALENDAR I2C 8-SOIC 816 $3.70
DS1307Z+ Maxim Integrated IC RTC CLK/CALENDAR I2C 8-SOIC 2687 $3.70
DS1340Z-33+ Maxim Integrated IC RTC CLK/CALENDAR I2C 8-SOIC 2777 $3.70
DS1391U-33+ Maxim Integrated IC RTC CLK/CALENDAR SPI 10-USOP 3729 $3.70
RX-8564LC:B3 PURE SN Epson IC RTC CLK/CALENDAR I2C 12-VSOJ 13165 $0.00