The PCF2129T is a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy ...
The ISL12022M is a low power real time clock developed by Intersil Corporation. The clock features a battery-backed SRAM, ±5 ppm temperature compensation, auto daylight saving, and embedded crystal.
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