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  1. SN7400 data sheet, product information and support | TI.com

  2. 7400 Datasheet(PDF) - ON Semiconductor

  3. 7400 - 7400 Quad 2-Input NAND Gate Datasheet - Futurlec

  4. SN7400 Datasheet (PDF) - Texas Instruments

  5. 7400 Datasheet – Quad NAND Gate, TTL, 14 Pin

  6. SN7400N Datasheet (PDF) - Texas Instruments

  7. 7400 Datasheet and Pinout | ElectroSchematics.com

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