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在许多场合,54/74HC高速CMOS电路需要与其他类型逻辑集成电路或控制电路接口.HCMOS可以方便地与54/74LS、CD4000标准CMOS和10,000ECL等各种逻辑电路接口.逻辑接口可以分为两个主要的类型:采用同一电源电压的接口和采用不同电源电压的接口.后一种情况,通常需要一些电平转移电路,但有许多实用的电路可以使这一步骤大大简化.在一般情况下,上述两种接口类型只需要很少的外部线路或者不需要外部线路.一、54/74HC与TTL的接口高速CMOS电路的工作电源电压为2～6伏,因而可以在同一个5伏电源电压下与TTL电路接口.HCMOS与TTL的连接可以是TTL输出驱动CMOS输入或CMOS输出驱动TTL输入.这两种情况的接口都十分简单.
On many occasions, 54 / 74HC high-speed CMOS circuits need to interface with other types of logic ICs or control circuits.HCMOS interfaces easily with a variety of logic circuits such as 54 / 74LS, CD4000, CMOS and 10,000ECL Logic interfaces can be divided into two The main types are: interfaces that use the same supply voltage and interfaces that use different supply voltages, the latter case usually requires some level shifter, but there are many practical circuits that can make this much easier: in the general case , The above two interface types require only a few external lines or do not need an external line I. 54 / 74HC and TTL interface High-speed CMOS circuit operating power supply voltage of 2 to 6 volts, which can be the same 5-volt supply voltage Under the TTL circuit interface .HCMOS and TTL connections can be TTL output driver CMOS input or CMOS output-driven TTL input .In both cases the interface is very simple.