RTC

RTC with External Crystal

• PCF2123TS/1,118 IC SPI RTC/CALENDAR 14TSSOP Digikey

NXP,new

SPI

• PCF8563T/5,518 IC RTC/CALENDAR 8SOIC Digikey

NXP, old

Dallas pin-compatible

I2C

• X1205 2-Wire™ RTC Real Time Clock/Calendar product page

Intersil

NO STOCK

PCB created

• M41T62Q6F IC RTC SERIAL W/ALARM 16QFN digikey

STM

Small Size

• DS1307Z+ IC RTC SERIAL 512K 8-SOIC digikey

Dallas-Maxim

Classic

• DS1302 IC TIMEKEEPER T-CHARGE 8-DIP digikey

Dallas-Maxim

Classic

Tested on 386 board

• Thread: Lowest cost RTC edaboard

RTC with internal crystal

• Thread: suggest Real Time Clock with inbuilt crystal edaboard

PCF2129

One of the best ratios performance/price

• Internal crystal
• Temperature compenation,
• 2ppm,
• Automotive,
• Timestamp

Disadvantages:

• SO16-wide is very big...

• PCF2129A Integrated RTC, TCXO and quartz crystal product page
• 568-4960-5-ND digikey
• datasheet

32.768KHz Accurate oscillator

• DS32KHZ product page

Accurate

Expensive

Reduced Availability