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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Maxim Integrated DS1343D-3+T&R

IC RTC CLK/CAL SPI 14TDFN

0

Epson RX-4574LC:B0 PURE SN

IC RTC CLK/CALENDAR SER 12-VSOJ

2.46

Epson RX-4581NB:B0 ROHS

IC RTC CLK/CALENDAR SPI 22-SON

2.46

Epson RX-4803SA:UB3 PURE SN

IC RTC CALENDAR SPI 14SOP

2.9

Epson RX-4035SA:B3 PURE SN

IC RTC CLK/CALENDAR SPI 14-SOP

2.85

Maxim Integrated DS1308U-3+

IC RTC CLK/CALENDAR I2C 8-UMAX

2.84

Epson RX-4045NB:AA3 PURE SN

IC REAL TIME CLOCK/CALENDAR

3.27

Renesas Electronics America Inc. ISL12022MIBZ-TR5421

IC RTC CLK/CALENDAR I2C 20-SOIC

3.27