clock circuit.
* LED direct drive by time-sharing (duplex)
* Wide operating voltage range
* Alarm on a 24-hour basis
* Time format: 12-hour AM/PM and 24hour
* On-chi.
50Hz/60Hz Input:
CR Input:
50/60 select input:
Display mode select input (alarm display/sleep display);
The on-chip Schmitt trigger circuit allows a simple RC filter at the input to remove possible line voltage transients. An internal pull-up re.
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