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本文介绍TTL中规模系列电路的一般使用方法。此系列产品属四机部优选品种,分计数器,译码器,编码器,寄存器,数据选择器,贮存器,运算部件及接口电路等共八个大类四十几个品种。是计算机,工业控制系统,仪器仪表的关键器件。并可同国内外相应的品种互换。一、TTL中规模电路的构成 (一)时序电路:这一类电路因其输出状态和现有的输入条件有关,也和电路的过去状态有关,具有贮存数码的功能。其输出状态的改变一般由时钟脉冲,及复位置位脉冲控制,因此,这一类电路基本上用触发器和反馈组合电路,控制门电路构成。 (二)组合逻辑电路:这一类电路它的输出状态仅取决于当时的输入条件与相应的控制条件,同电路的过去状态无关,没有贮存数码的功能。这类电路是由
This article describes the general use of scale series circuits in TTL. This series of products are four machine parts preferred varieties, sub-counters, decoders, encoders, registers, data selector, memory, computing components and interface circuits, a total of eight major categories of more than 40 varieties. Is the computer, industrial control systems, instrumentation, the key components. And with the corresponding species at home and abroad swap. First, the structure of TTL scale circuit (A) timing circuit: This type of circuit because of its output state and the existing input conditions, but also the past state of the circuit, with the function of storing digital. The output state change is generally controlled by the clock pulse and reset pulse, so this type of circuit is basically composed of flip-flop and feedback combination circuit, control gate. (B) combinational logic circuit: This type of circuit its output state depends only on the input conditions and the corresponding control conditions, the circuit has nothing to do with the past status, there is no function to store digital. This type of circuit is made from