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74LS257 Datasheet PDF - Renesas Electronics

部品番号コンポーネント説明メーカー
74LS257 Quadruple 2-line-to-1-line Data Selectors / Multiplexers (with not inverted 3-state outputs) Renesas
Renesas Electronics Renesas
Other PDF  no available.
74LS257 Datasheet PDF : 74LS257 pdf   
HD74LS257P image

This multiplexer features three-state outputs that can interface directly with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (at a high-impedance state) the low impedance of the single enabled output will drive the bus line to a high or low logic level.
To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output enable circuitry is designed such that the output disable times are shorter than the output enable times.

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