74148

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8-to-3 line inverting priority encoder with cascade inputs

    +---+--+---+
/A4 |1  +--+ 16| VCC
/A5 |2       15| /EO
/A6 |3       14| /GS
/A7 |4   74  13| /A3
/EI |5  148  12| /A2
 Y2 |6       11| /A1
 Y1 |7       10| /A0
GND |8        9| Y0
    +----------+