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
DS1340U-3+T&R Maxim Integrated IC RTC CLK/CALENDAR I2C 8-USOP 5905 $0.00
MCP795W20-I/ST Microchip Technology IC RTC CLK/CALENDAR SPI 14-TSSOP 221 $1.69
MCP795W11-I/ST Microchip Technology IC RTC CLK/CALENDAR SPI 14-TSSOP 488 $1.69
ISL12026IVZ-T Renesas Electronics America Inc. IC RTC CLK/CALENDAR I2C 8-TSSOP 3945 $0.00
MCP795W10-I/ST Microchip Technology IC RTC CLK/CALENDAR SPI 14-TSSOP 171 $1.61
MCP795W10-I/SL Microchip Technology IC RTC CLK/CALENDAR SPI 14-SOIC 290 $1.57
DS1342T+T&R Maxim Integrated IC RTC CLK/CALENDAR I2C 6-TDFN 3862 $0.00
PCA21125T/Q900/1,1 NXP USA Inc. IC RTC CLK/CALENDAR SPI 14-TSSOP 3271 $0.00
PCA85063ATT/AJ NXP USA Inc. IC RTCC I2C/ALARM 8TSSOP 5121 $1.20
PCF8563TS/5,118 NXP USA Inc. IC RTC CLK/CALENDAR I2C 8-TSSOP 2976 $0.00