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数字电子计算机与终端设备的联接以及自动控制系统中,逻辑电路与执行电路之间的联接,往往需要同时使用不同类型的分立元件电路与集成电路。但由于晶体管分立电路的逻辑电平较之集成电路高2～5倍,而开关速度又较之迟缓。因此,它们之间一般不能直接进行耦合,必须通过合适的转接电路,使其逻辑电平和开关速度相一致。尽管转接电路的方式多种多样,所采用的元件与组成方式也有所不同,但主要以输入接口电路和输出接口电路作为分类的依据。前者用以将高电平转换为低电平,后者用以推动大功率负载。这里仅对几种常用的接口电路作一简要分析。
Digital electronic computer and terminal equipment connection and automatic control system, the logic circuit and the implementation of the connection between the circuit, often need to use different types of discrete components circuits and integrated circuits. However, due to the logic level of the discrete transistor circuit than the integrated circuit 2 to 5 times higher, while the switching speed is slower than the slow. Therefore, they can not be directly coupled between the general, must be through the appropriate adapter circuit, the logic level and switching speed consistent. Although the way of diversion of the circuit is varied, the components and composition adopted are different, but it is mainly based on the input interface circuit and output interface circuit. The former is used to convert high to low, which is used to drive high-power loads. Here only a few commonly used interface circuit for a brief analysis.