SN74HCT257 - Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs

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 V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Products containing the "SN74HCT257" keyword are: SN74HCT257D , SN74HCT257D , SN74HCT257DE4 , SN74HCT257DG4 , SN74HCT257DG4 , SN74HCT257DR , SN74HCT257DR , SN74HCT257DRE4 , SN74HCT257DRE4 , SN74HCT257DRG4 , SN74HCT257DT , SN74HCT257N , SN74HCT257N

• Operating Voltage Range of 4.5 V to 5.5 V
• High-Current 3-State Outputs Interface Directly With System Bus
• Typical t_pd = 17 ns
• Low Power Consumption, 80-µA Max I_CC
• ±6-mA Output Drive at 5 V
• Low Input Current of 1 µA Max
• Inputs Are TTL-Voltage Compatible
• Provide Bus Interface From Multiple Sources in High-Performance Systems
• Buffered Inputs and Outputs