A 2-to-4 decoder operates according to the truth Table 1 with enable input (EI). This EI is used for activate (EI = 1) or deactivate (EI = 0) the decoder. Decoding is essential in applications such as ...

The 74HC154 device has two input enable lines E0 and E1. If one or both enable lines are HIGH all outputs are HIGH and there is no line LOW. If both enable lines are LOW, there is one line LOW ...