HD74HC258 Datasheet | Hitachi Semiconductor

Quad. 2-to-1-line Data Selectors/Multiplexers (with 3-state outputs) Description The large output drive capability coupled with the 3-state feature make this device ideal for interfacing with bus lines in a bus organized system. When the output control input line is taken high, the outputs of all four multiplexers are sent into a high impedance state. When the output control line is low, the select input chooses whether the A or B input is used. Features - - - - - High Speed Operation: tpd (Data to Y) = 11 ns typ (CL = 50 p F) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs Output Control H L L L L Select X L L H H A X L H X X B X X X L H Outputs Y Z H L H L Notes H: high level L : low level X: irrelevant Z: off (high-impedance) state of a 3-state output Pin Arrangement Select 1A Inputs 1B Outputs 1Y 2A Inputs 2B Outputs 2Y GND 1 2 3 4 5 6 7 8 1A 1B 1Y 2A 2B 2Y 3Y S G 4A 4B 4Y 3A 3B 16 VCC 15 Output cotrol 14 4A Inputs 13 4B 12 4Y 11 3A Inputs 10 3B 9 3Y Output Output (Top...