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74HC257 - Quad. 2-to-1-line Data Selectors/Multiplexers

General 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.

Key Features

  • High Speed Operation: tpd (Data to Y) = 10.5 ns typ (CL = 50 pF) 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 L L L L H Select L L H H X A L H X X X B X X L H X Outputs Y L H L H High impedance Notes H: high level, L: low level, X: irrelevant HD74HC257 Pin Arrangement Select.

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The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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HD74HC257 Quad. 2-to-1-line Data Selectors/Multiplexers (with noninverted 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) = 10.