CY74FCT2257T Datasheet - Texas Instruments

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CY74FCT2257T QUAD 2-INPUT MULTIPLEXER

D Function and Pinout Compatible With FCT and F Logic D 25-Ω Output Series Resistors to Reduce Transmission-Line Reflection Noise D TTL Output Level V.
The CY74FCT2257T has four identical two-input multiplexers that select four bits of data from two sources under the control of a common data-select (S.

CY74FCT2257T-etcTI.pdf