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When is a logic level above a high threshold?
When above the high threshold, the signal is “high”. Intermediate levels are undefined, resulting in highly implementation-specific circuit behavior. It is usual to allow some tolerance in the voltage levels used; for example, 0 to 2 volts might represent logic 0, and 3 to 5 volts logic 1.
How are the different levels of logic represented?
Logic levels are usually represented by the voltage difference between the signal and ground, although other standards exist. The range of voltage levels that represents each state depends on the logic family being used.
What should the voltage of a logic input be?
“Acceptable” input signal voltages range from 0 volts to 0.8 volts for a “low” logic state, and 2 volts to 5 volts for a “high” logic state.
What are the different levels of the ICS?
ICS partitioning is much different. The ICS is partitioned into three levels (0, 1, and 2), as defined by the ISA95/Purdue reference model. Level 0 represents the physical process; Level 1 is control and monitoring; and Level 2 is supervisory control.
Which is the correct definition of a logic level?
Put simply, a logic level is a specific voltage or a state in which a signal can exist. We often refer to the two states in a digital circuit to be ON or OFF. Represented in binary, an ON translates to a binary 1, and an OFF translates to a binary 0.
What are the logic levels in digital electronics?
Logic levels, in the broadest sense, describes any specific, discrete state that a signal can have. In digital electronics, we generally restrict our study to two logic states – Binary 1 and Binary 0. What is a logic level?
How are input and output logic levels solved?
This problem was solved by the invention of the 74HCT family of devices that uses CMOS technology but TTL input logic levels. These devices only work with a 5 V power supply. In three-state logic, an output device can be in one of three possible states: 0, 1, or Z, with the last meaning high impedance.