What is the common power supply voltage used for TTL series integrated circuits?

The common power supply voltage used for TTL (Transistor-Transistor Logic) series integrated circuits is 5 volts. This standard voltage level has been widely adopted since the introduction of TTL technology, as it provides a good balance between performance and power consumption. The 5-volt supply allows TTL circuits to operate effectively while minimizing power dissipation, which is critical for ensuring reliability and longevity in electronic devices.

TTL circuits are designed to work within certain voltage thresholds, and the 5-volt standard allows for clear high and low logic levels, facilitating reliable communication between digital components. Other voltage options like 3 volts, 9 volts, and 12 volts are either lower than the typical operating range for standard TTL or are used in different types of logic families or specific applications. Consequently, while other voltages may be used for different technologies or specific circumstances, 5 volts remains the recognized and most common supply voltage for TTL circuits.