HT1380 chip equivalent, serial timekeeper chip.
* Operating voltage: 2.0V~5.5V
* Maximum input serial clock: 500kHz at VDD=2V,
2MHz at VDD=5V
* Operating current: less than 1mA at 2V,
less than 1.2mA at 5V .
* Microcomputer serial clock
* Two data transmission modes: single-byte, or burst mode
* Serial I/O transmi.
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