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大多数逻辑器件的电源电压为5V,但也有的器件不在5V电源下工作的。在这种情况下,常需要了解其上、下开关阈值。有时,了解这些阈值如何随电源电压变化也十分重要。图1就是一个可以
Most logic devices have a supply voltage of 5V, but some devices do not operate at 5V. In this case, often need to know the upper and lower switching threshold. Sometimes it is also important to understand how these thresholds vary with the supply voltage. Figure 1 is one can