Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEEE / ANSI

ANSI three-state inverter with active-low enable

The three-state inverter is a triangle with an output bubble and a control lead entering the sloping side. A bubble on the control lead means output enable is active low, which is the arrangement on many octal line drivers. When disabled, the output is high impedance.

Drawing use: Schematic
Application: Logic & signals
Reference family: IEEE / ANSI / Manufacturer
Form evidence: Inverter triangle with bubble and enable lead with bubble on the triangle side. Distinctive-shape form as used in IEEE/ANSI-style schematics and manufacturer data books. Independent educational drawing; exact standard geometry and compliance are not asserted.

A distinction that matters

The non-inverting three-state buffer has no output bubble.

Full reference

3STATE

Symbols

Three-state logic buffer

A digital output stage that can drive logical states or enter its documented high-impedance state.

Drawing use: Schematic
Application: Logic & signals
Reference family: Manufacturer

A distinction that matters

High impedance differs from driving logical zero; disabled outputs still have device-specific leakage and voltage limits.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.