Transistor-Transistor TTL Logic and Totem pole output

[Patrick Chung]

By combining basic TTL Logic NAND gate with invertors and other gate any logical function can be realized in TTL technology. TTL family of logic circuits is specially empowered with TTL Totem pole output

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http://www.cirvirlab.com/index.php/electronic/181-transistor-transistor-ttl-logic.html