Truth Tables of Missing Logic of the 7400 Family

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Transistor-transistor logic (TTL) chips cover a wide range of logic combinations, but there are some logic functions that are not directly implemented in standard TTL chips. These include:

Not directly implemented in standard TTL chips

Exclusive-OR (XOR) with more than two inputs

While standard TTL chips include XOR gates with two inputs, XOR gates with three or more inputs are not typically available as standalone chips.

Majority function

This logic function outputs a 1 if the majority of its inputs are 1. Majority functions are not commonly available as standalone TTL chips.

Comparator functions

TTL chips typically do not include dedicated chips for comparator functions, which compare two binary values and output specific signals based on their relationship (e.g., greater than, less than, equal to).

Arithmetic functions

Complex arithmetic operations such as addition, subtraction, multiplication, and division are not directly implemented in standard TTL chips. These operations are typically performed using combinations of basic logic gates.

Programmable logic functions

While modern programmable logic devices (PLDs) and field-programmable gate arrays (FPGAs) offer extensive programmability and flexibility, standard TTL chips do not provide this level of configurability.

While these logic functions are not directly covered by standard TTL chips, they can often be implemented using combinations of basic gates or through the use of more specialized integrated circuits. Additionally, modern digital design often employs programmable logic devices or custom ASICs (Application-Specific Integrated Circuits) to implement complex logic functions efficiently. —Chat GPT 3.5