SN74HCT257DR

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SN74HCT257DR

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

Packaging

Package | PIN: D | 16
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $0.44
10-24 $0.39
25-99 $0.36
100-249 $0.30
250-499 $0.27
500-749 $0.21
750-999 $0.16
1000+ $0.14

Features

  • Operating Voltage Range of 4.5 V to 5.5 V
  • High-Current 3-State Outputs Interface Directly With System Bus
  • Typical tpd = 17 ns
  • Low Power Consumption, 80-µA Max ICC
  • ±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

Texas Instruments  SN74HCT257DR

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.