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.

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Texas Instruments BQ4802YDW

IC RTC CLK/CALENDAR PAR 28-SOIC

7.69

Epson RTC-7301SF:B ROHS

IC REAL TIME CLOCK/CALENDAR

6.85

Epson RX-8801SA: UB PURE SN

IC REAL TIME CLOCK/CALENDAR

6.56

Maxim Integrated DS1685QN-3+

IC RTC CLK/CALENDAR PAR 28-PLCC

6.52

Epson RTC-72423B: PURE SN

IC REAL TIME CLOCK/CALENDAR

6.47

Epson RTC-72423A: PURE SN

IC REAL TIME CLOCK/CALENDAR

6.47

Epson RTC-72421A: PURE SN

IC REAL TIME CLOCK/CALENDAR

6.31

Maxim Integrated DS1685-5IND+

IC RTC CLK/CALENDAR PAR 24-DIP

6.3