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
MCP7940M-I/P Microchip Technology IC RTC CLK/CALENDAR I2C 8DIP 0 $0.66
M48T02-70PC1 STMicroelectronics IC RTC CLK/CALENDAR PAR 24DIP 223 $13.95
ISL12022IBZ Renesas Electronics America Inc. IC RTC CLK/CALENDAR I2C 8-SOIC 0 $4.51
RTC-8564JE:B3:ROHS Epson IC RTC CLK/CALENDAR I2C 20-VSOJ 0 $0.00
DS1743P-85+ Maxim Integrated IC RTC CLK/CALENDAR PAR 34-PCM 80 $16.21
DS1315EN-5+ Maxim Integrated IC RTC PHANTOM PAR 20-TSSOP 88 $18.77
DS17485-3+ Maxim Integrated IC RTC CLK/CALENDAR PAR 24-DIP 96 $11.00
M41T315V-85MH6F STMicroelectronics IC RTC PHANTOM SER 28-SOIC 1872 $7.74
ISL12022MIBZ Renesas Electronics America Inc. IC RTC CLK/CALENDAR I2C 20-SOIC 57 $6.52
BQ3285P-SB2 Texas Instruments IC RTC CLK/CALENDAR PAR 24-DIP 78 $4.26