In this paper, we show a kind of LED digital clock which based on IC. In actually digital clock is a circuit which counting by standard frequency. We use quartz crystal oscillator circuit constitute digital clock. Through frequency division we get pulse signal and put it in counter. Take the signal counter output go through decoder / driver to strokes paragraph the digital display corresponding, making the "hour", "minute", "seconds" to the figures. It's time for the 12-hour cycle, indicating full-scale for 11:59, while it have a function of the time adjustment. The circuit composed by the clock pulse generator, plastic circuit, divider, counter, decoder / driver, time adjusting circuit. Use LED display screen, display circuit showing the clear and intuitive digital symbols in the decoding of the driven output.
LED Digital Clock is a clock device comply by digital circuit technology, compared with the mechanical clock it has a higher accuracy and intuitive, and no mechanical devices, with a longer life, which have a better expansion, it will be widely used.
Keywords: Integrated chips, digital clock, LED display
