Logic Level

maker

The voltage range in which a digital circuit recognizes input signals as representing binary states.

expanded

Logic level specifies the voltage thresholds that classify digital circuits' inputs as either a binary '0' or '1'. These levels are crucial for ensuring compatibility between different digital systems. Common logic levels include TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor).

examples

A microcontroller with 5 V TTL logic levels requires an input voltage below 0.8 V to recognize a binary '0' and above 2 V to recognize a binary '1'.

Widely used in microcontroller-based projects, particularly in educational kits and robotics.

A Raspberry Pi GPIO pin operates at 3.3 V CMOS logic levels, recognizing voltages below 1.0 V as '0' and above 2.3 V as '1'.

Commonly employed in embedded systems and home automation projects where energy efficiency is important.

related terms

Logic analyzer

A logic analyzer is an electronic instrument used to capture and display multiple signals from a digital circuit or system.

Voltage

Voltage is the electric potential difference between two points within an electric field, expressed in volts (V).

Ground

Ground refers to a reference point in an electrical circuit from which voltages are measured.

Series circuit

An electrical circuit configuration where components are connected end-to-end so the current flows through each component in a single path.

Resistance

The opposition to the flow of electric current, typically measured in ohms (Ω).