SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A.
SN74ALS257A - Quad 2-Line To 1-Line Data Selectors/Multiplexers
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2ĆLINE TO 1ĆLINE DATA SELECTORS/MULTIPLEXERS WITH 3ĆSTATE OUTPUTS S.