它们有一个低功耗与低输出阻抗的简单结构，可以用作超大规模集成电路设计中的接口电路，以减少基片的外部引线数。

They have a simple construction with low power dissipation and low output impedance and can be used as interfacing circuits in VLSI designs to reduce the number of external connections on a chip.

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本文具体介绍了三种实时日历时钟集成电路的功能以及与单片机的连接方法，给出了接口电路。

The paper introduces three functions of the integrated circuit of real-time calendar clock and the interconnection method with single chip computer. The interfacing circuit is also given.

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介绍了常用的数字集成电路的种类，并对TTL、ECL、CMOS电路相互间的接口转换技术进行了研究。

This paper introduces the common category of digital integrated circuit, and research the interface transform technology among TTL? ECL? CMOS circuit one another.

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