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数字时钟电路的设计与仿真

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数字时钟设计既是电子教学中最为典型的综合性实验之一,也在商业领域有着极为广泛地应用。文中介绍了一种以74LS190同步可预置的十进制可逆计数IC为主功能芯片,联合其他逻辑门器件共同实现数字时钟功能的电路。该电路包含4个子模块,分别是1Hz脉冲产生电路、计数电路、手动校时电路和整点报时电路。设计过程中利用EWB5.0软件仿真,既提高了设计效率,又节约了设计成本。经验证,该电路工作稳定可靠,达到了预期的效果。

The digital clock circuit is not only the most typical experiment in electronic teaching,but also widely applied in commercial field. This thesis offers a circuit design of digital electronic clock.74LS190,the preset synchronous decimal counter IC,is the main functional chip in this circuit and can implement the function of digital electronic clock through combining with other logic gate devices. There are 4 sub-modular circuits in the design and they are 1Hz pulse generation circuit,counter circuit,manual checking circuit and hourly chime circuit. It is efficient and economical to use EWB5. 0 to simulate the circuit in the process. And after the verification,the design can achieve requirements steadily and reliably.