3.3V, 32 Mbit (1or='#FF0000'>024 KBit x 32) timekeeper® sRAM Multi-channel clock distribution circuit serial real-time clock with 44 bytes NVRAM and reset serial I2C bus RTC with battery switchover 3.3V, 32 Mbit (1or='#FF0000'>024 KBit x 32) timekeeper® sRAM 模拟IC serial sPI bus RTC with battery switchover 模拟IC