DS1307 64 x 8, Serial, I²C Real-Time Clock
DS1339, DS1339C, DS1339U I²C Serial Real-Time Clock
DS1374, DS1374C, DS1374U I²C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
DS1338, DS1338C, DS1338U, DS1338Z I²C RTC with 56-Byte NV RAM
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