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The SN74HC157D, SN74HCT157N,HC157D, HC157 are quad 2-input multiplexer. The device features select (S) and enable E inputs. A HIGH on S selects data source 1, a LOW data source 0. A HIGH on E forces all the outputs (1Y to 4Y) LOW. Inputs include clamp diodes.
The SN74HC157D, SN74HCT157N,HC157D, HC157 are quad 2-input multiplexer. The device features select (S) and enable E inputs. A HIGH on S selects data source 1, a LOW data source 0. A HIGH on E forces all the outputs (1Y to 4Y) LOW. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC. Datasheet: (PDF) Features: Packing List: 1Pc * SN74HC157D Quad 2-input Data Multiplexers IC