74XX157 - Quad 2 to 1 data selector

            Ŀ
          Ĵ              Ŀ
      A/B                  VCC    Ŀ
          Ĵ                            INPUTS        OUTPUT 
          Ĵ              Ŀ        Ĵ        
      1A                    !G    STROBESELECTDATA         
          Ĵ                         _    _   Ĵ        
          Ĵ              Ŀ           G    A/B  A B        
      1B                    4A    Ĵ
          Ĵ                         H     X   X X    L   
          Ĵ              Ŀ           L     L   L X    L   
      1Y                    4B       L     L   H X    H   
          Ĵ                         L     H   X L    L   
          Ĵ              Ŀ           L     H   X H    H   
      2A                    4Y    
          Ĵ              
          Ĵ              Ŀ
      2B                    3A
          Ĵ              
          Ĵ              Ŀ
      2Y                    3B
          Ĵ              
          Ĵ              Ŀ
      GND                   3Y
          Ĵ              
            
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