Understand the difference.

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

2k

IEC

IEC even-parity element

The 2k qualifier means the output is active when an even number of inputs, including none, are active. It is the multi-input generalisation of exclusive-NOR and is used in parity generation and checking for data words.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

Rectangular element with the 2k general 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.

A distinction that matters

The 2k+1 element is its complement and gives odd parity.

Full referenceAdd to legend

2k+1

IEC

IEC odd-parity element

The 2k+1 qualifier means the output is active when an odd number of inputs are active. It is what a cascade of two-input exclusive-OR gates actually computes, and it is the correct IEC qualifier for an odd-parity tree drawn as a single element.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

Rectangular element with the 2k+1 general 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 =1 element gives the same result only for two inputs.

Full referenceAdd to legend

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