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
MCP7940N-I/SN Microchip Technology IC RTC CLK/CALENDAR I2C 8-SOIC 16455 $0.76
BQ32000DR Texas Instruments IC RTC CLK/CALENDAR I2C 8-SOIC 13256 $0.00
S-35390A-T8T1G ABLIC U.S.A. Inc. IC RTC CLK/CALENDAR I2C 8-TSSOP 33938 $0.00
S-35390A-J8T1G ABLIC U.S.A. Inc. IC RTC CLK/CALENDAR I2C 8-SOP 35557 $0.00
CBC92141C-Q3-TR3 Cymbet Corporation POWER MANAGER / RTC 4.1V VBAT 0 $1.98
CBC92132C-Q3-TR3 Cymbet Corporation POWER MANAGER / RTC 3.2V VBAT 0 $0.00