Fan-in

Fan-in

Practical digital circuits

Published in T.J. Stonham, Digital Logic Techniques, 2017

Fan-in is the number of logic outputs that can be connected to a logic gate input. A fan-in greater than 1 was possible with the now obsolete RTL, where every output was fed via its own external resistor to the input in question. Standard TTL outputs, must NEVER be connected together, as the internal transistors will be overloaded if one output is low and another is high. The fan-in of a standard TTL gate is therefore 1. Special open collector gates can be obtained, where the output transistor load is not included on the chip. It has to be supplied externally.

Assessing the changeability of component-based system design: a controlled experiment

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Journal Information

Published in International Journal of Computers and Applications, 2022

Majdi Abdellatief, Abu Bakar Md Sultan, Abdul Azim Abdul Ghani, Abubaker Wahaballa

Fan-in is defined with respect to each interface as ‘Fan-in of an interface “I” is the sum of inter-flows into an interface “I” plus the number of intra-flows that an interface “I” retrieves.’ But, Fan-out is defined as ‘Fan-out of an interface “I” is the sum of inter-flows from an interface “I” plus the number of intra-flows that an interface “I” updates.’

Computational Investigation of Quantum Transport to Design Single-Strand DNA Logic Gate Using Silicon Carbide Nanotube Electrode

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Journal Information

Published in IETE Journal of Research, 2022

Pradipta Roy, Debarati Dey, Debashis De

Fan-in is the maximum number of inputs of a logic gate. In this case, four numbers of Fan-in are used. Two inputs are applied at the two ends of the electrodes. Another two inputs are applied at the top and bottom of the logic gate via gate bias.

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Practical digital circuits

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