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Alarm with Snooze. D. Sleep Timer. Applications: D. Alarm Clock. D. Clock Radio. Absolute ... When the alarm set time is reached, the alarm signal is delivered. ... The On–Chip Schmitt Trigger circuit allows a simple RC filter at the input to remove possible line voltage transients. An internal pull–up resistor is provided.
CR Input: (Note 1)
When AC power–down occurs, the time counter enters the “hold” mode and the on–chip clock oscillator starts operating immediately. If there is no input at “50/60Hz input” during 3–clock period, this oscillator controls the time counter advance instead of “50/60Hz input”. The values of CR determine the
frequency of the on–chip clock oscillator. All segment outputs are off during backup operation. If the
backup OSC is used at the power–down mode, “50/60Hz input” must be open or at VSS level.