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CD74HCT257 - Quad 2-Input Multiplexer

Download the CD74HCT257 datasheet PDF. This datasheet also covers the CD74HC257 variant, as both devices belong to the same quad 2-input multiplexer family and are provided as variant models within a single manufacturer datasheet.

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Note: The manufacturer provides a single datasheet file (CD74HC257-etcTI.pdf) that lists specifications for multiple related part numbers.

General Description

The ’HC257 and ’HCT257 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select Input (S).

The Output Enable input (OE) is active LOW.

When OE is HIGH, all of the outputs (1Y-4Y) are in the high impedance state regardless of all other input conditions.

Overview

Data sheet acquired from Harris Semiconductor SCHS171D November 1997 - Revised October 2003 CD54HC257, CD74HC257, CD54HCT257, CD74HCT257 High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting.

Key Features

  • Buffered Inputs.
  • Typical Propagation Delay ( In to Output ) = 12ns at VCC = 5V, CL = 15pF, TA = 25oC.
  • Fanout (Over Temperature Range) - Standard Outputs.
  • 10 LSTTL Loads - Bus Driver Outputs.
  • . . . 15 LSTTL Loads.
  • Wide Operating Temperature Range . . . -55oC to 125oC.
  • Balanced Propagation Delay and Transition Times.
  • Significant Power Reduction Compared to LSTTL Logic ICs.
  • HC Types - 2V to 6V.

More Datasheets from Texas Instruments

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