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Three state table buffers
Three state table buffers: A bus system can be constructed with the help of three state gates instead of multiplexers. A three states gate is digital circuit which exhibits three states.
Two of states are signals equivalent to logic 1 and 0 as in a conventional gate. The third one is a high-impedance state. The high-impedance states acts like an open circuit, which means that output is disconnected and does not have any logic, such as AND or NAND gate . However one most commonly used in design of a bus system is the buffer gate.
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Give the circuit of a TTL NAND gate and explain its operation in brief. Ans: Operation of TTL NAND Gate: Fig.(d) Demonstrates a TTL NAND gate with a totem pole output.
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