IL8560

50Hz/60Hz Input: The on-chip Schmitt trigger circuit of the IL8560 allows a simple RC filter at the input to remove possible line oltage transients. An internal pull-up resister is provided.

CR Input of the IL8560: Then 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 "50/60 Hz input" during 3-clock period, this oscillator controls the time cou nter advance instead of "50/60Hz input". The values of CR determine the frequency of the on-chip clock oscillator. All s egment outputs are off during backup oscillator operation. NOTE: If the backup OSC is used at the power-down mode, "50/60Hz input" must be open or at Vss level.

50/60 select input of the IL8560: Connecting "50/60Hz select" to Vss enables 50Hz operation. For 60Hz operation, "50/60Hz select" is left unconnected: Pull-down to V_DD is provided by the internal pulldown resister.

Display mode select input (alarm display/sleep display); The internal pull-down resistor allows the use of 2 SPST (single-pole single- throw) switches to select 4 display modes listed in Table 1.