FAlL_SAFE_LIGHT_TIMEB

Published:2009/7/13 1:49:00 Author:May | From:SeekIC

National MM5309 clock IC is used as timer in circuit that maintains timing with adequate accuracy during periods of power-line failure and retums automatically to 60-Hz line as soon as power is restored. Applications include control of lights in unoccupied home. Timing action tums on lights for 4h period every 24 h. When power is applied, intemal multiplex circuit strobes each digit until digit with connected diode is accessed. This digit stops multiplex scanning, and BCD outputs present data from selected digit as control waveform whose edges determine timer data.- MOS/LSI Databook, National Semiconductor, Santa Clara, CA, 1977, p 1.74-1-77.



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