SN74HC257 Datasheet – Decoder/Encoder/Multiplexer – TI

Part Number: SN74HC257

Function: Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs

Manufacturer: Texas Instruments

Pinout: SN74HC257 Datasheet


These devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (G\) input is at a high logic level.

To ensure the high-impedance state during power up or power down, (G\) should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

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Block Diagram :

SN74HC257 Block Diagram

SN74HC257 Datasheet