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SN74HCT257D-SN74HCT257DR Fast Delivery,Good Price
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Partno Mfg Dc Qty AvailableDescript
SN74HCT257DTIN/a2000avaiQuadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs
SN74HCT257DRTIN/a2880avaiQuadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs


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SN74HCT257D-SN74HCT257DR
Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs
Low Power Consumption, 80-µA Max ICC ±6-mA Output Drive at 5 V Buffered Inputs and OutputsA/B
GND
VCC
SN54HCT257 ... J PACKAGE
SN74HCT257 ...D OR N PACKAGE
(TOP VIEW)
A/BNC3BOE
GND
SN54HCT257... FK PACKAGE
(TOP VIEW)

NC − No internal connection
description/ordering information

The ’HCT257 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 (OE) input is at
the high logic level.
To ensure the high-impedance state during power up or power down, OE 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.
ORDERING INFORMATION

†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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