Understand the difference.

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

=1

IEC

IEC exclusive-OR gate (rectangular form)

The =1 qualifier defines an exclusive-OR in the strict IEC sense: exactly one input must be active for the output to be active. For a two-input element this matches the familiar XOR truth table. For more than two inputs it is not the same as a cascaded parity function, which IEC writes as 2k+1.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

Rectangular outline with the =1 qualifier. Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

The 2k+1 odd-parity element gives the same result for two inputs but a different result for three or more.

Full referenceAdd to legend

XOR

Symbols

Exclusive-OR gate

For two positive-logic inputs, produces a true output when the input states differ.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

Two-input XOR is not inclusive OR; for more inputs verify whether the device implements odd parity or another specified function.

Full referenceAdd to legend

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