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
DS1337U+ Maxim Integrated IC RTC CLK/CALENDAR I2C 8-USOP 4568 $2.93
RX-8564LC:B0 PURE SN Epson IC RTC CLK/CALENDAR I2C 12-VSOJ 2333 $0.00
ISL1208IB8Z Renesas Electronics America Inc. IC RTC CLK/CALENDAR I2C 8-SOIC 1234 $2.54
RX-8571LC:B3 PURE SN Epson IC RTC CLK/CALENDAR I2C 12-VSOJ 978 $0.00
PCF2127T/2Y NXP USA Inc. IC RTC CLK/CAL I2C/SPI 16-SOIC 3316 $0.00
NJU6355EM NJR Corporation/NJRC IC RTC CLK/CALENDAR SER 8-EMP 1704 $2.00
PCF2129T/2,518 NXP USA Inc. IC RTC CLK/CAL I2C/SPI 16-SOIC 3770 $0.00
M41T83SQA6F STMicroelectronics IC RTC CLK/CALENDAR I2C 16-QFN 2383 $0.00
M41T93ZQA6F STMicroelectronics IC RTC CLK/CALENDAR SPI 16-QFN 1790 $0.00
PCF2129AT/2,518 NXP USA Inc. IC RTC CLK/CAL I2C/SPI 20-SOIC 7294 $0.00