SN74LS257BN
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Quad 2-Line to 1-Line Data Selectors/Multiplexers with 3-State Non-Inverting Outputs, Low-Power Schottky TTL, upgraded high-performance "B" revision, 16-pin Plastic DIP. 100% Exact Replacements: SN74LS257AN, DM74LS257BN, HD74LS257BIP, 74LS257N, NTE74LS257.
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