IC, DS12887 real time clock chip, with battery - Syntaur
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Amazon.com: DAOKI 5Pcs RTC I2C Module Arduino I2C RTC DS1307 AT24C32 Real Time Clock Module 24C32 Memory High Precision for AVR ARM PIC SMD Compatible with Arduino with 60 Pin : Electronics
Adafruit PCF8523 Real Time Clock Assembled Breakout Board : ID 3295 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
SparkFun Real Time Clock Module - BOB-12708 - SparkFun Electronics
Real Time Clock (RTC) Unit (HYM8563) | m5stack-store
Dallas DS1287 DS12887 DS12B887 BQ3287 OEC12C887 real time clock chip 386 486 RTC | eBay
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PCF2131 | Nano-Power Highly Accurate Real Time Clock | NXP Semiconductors
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![ChronoDot - Ultra-precise Real Time Clock [v3] : ID 255 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/970x728/255-05.jpg "ChronoDot - Ultra-precise Real Time Clock [v3] : ID 255 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits")
ChronoDot - Ultra-precise Real Time Clock [v3] : ID 255 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Real time clock (RTC) vs. clock: What is the difference?
Grove - High Precision RTC (Real Time Clock) | Seeed Studio Wiki
