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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NXP USA Inc. PCF2123U/12HA/1,00

IC RTC CLK/CALENDAR SPI DIE

0.33

NXP USA Inc. PCF8564AU/5BB/1,01

IC RTC CLK/CALENDAR I2C DIE

0.3

NXP USA Inc. PCF8564AU/5GB/1,01

IC RTC CLK/CALENDAR I2C DIE

0.3

Maxim Integrated DS1747-70IND+

IC RTC CLK/CALENDAR PAR 32-EDIP

38.99

Maxim Integrated DS1251W-120IND+

IC RTC PHANTOM PAR 32-DIP

38.52

Maxim Integrated DS1251WP-120+

IC RTC PHANTOM PAR 34-PCM

35.46

Maxim Integrated DS1248WP-120+

IC RTC PHANTOM PAR 34-PCM

28.79

Texas Instruments DP8570AVX/NOPB

IC RTC CLK/CALENDAR PAR 28-PLCC

20.88