The MM74C150 and MM82C19 multiplex 16 digital lines to 1 output. A 4-bit address code determines the particular 1-of-16 inputs which is routed to the output. The data is inverted from input to output. A strobe override places the output of MM74C150 in the logical “1” state and the output of MM82C19 in the high-impedance state. All inputs are protected from damage due to static discharge by diode clamps to VCC and GND.