论文部分内容阅读
数字集成电路广泛应用于微型计算机、通信设备及各仲仪器仪表中。以前,大多数设计者在工作频率较高时都首先选用低功耗TTL电路(LSTTL),甚至于采用ECL电路。只有在工作频率低时才采用功耗极低的CD4000系列CMOS电路。近几年来由于工艺水平的提高CMOS电路采用了3.5μm的硅栅工艺制造,产生了CD74HC/CD54HC和CD74HCT/CD54HCT系列的高速CMOS集成电路(即QMOS集成电路)。它的功耗相当于CD4000系列电路,而工作频率却和低功耗肖特基TTL电路(LSTTL)一样,QMOS除了速度快、功耗低这些特点以外,还有与其它数字电路良好的接口灵活性,即逻辑匹配和负载驱动能力,给电路设计和设备维修带来极大的方便。
Digital integrated circuits are widely used in microcomputers, communications equipment and secondary instrumentation. In the past, most designers first selected low-power TTL circuits (LSTTLs) even at higher frequencies, even using ECL circuits. Only use the CD4000 series CMOS circuit with low power consumption only when the operating frequency is low. In recent years due to the improvement of the level of the CMOS circuit using 3.5μm silicon gate process to create, produced CD74HC / CD54HC and CD74HCT / CD54HCT series of high-speed CMOS integrated circuits (QMOS integrated circuits). Its power consumption is equivalent to the CD4000 series circuit, and operating frequency and low-power Schottky TTL circuit (LSTTL), QMOS in addition to fast, low power consumption these features, there are other digital circuits and good interface flexibility Sex, that is, logic matching and load driving ability, bring great convenience to circuit design and equipment maintenance.