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

IEC

IEC adder (Σ)

The adder qualifier is the capital sigma. Inputs are grouped into P and Q words with binary weights, plus a carry input CI; outputs give the sum with weights and a carry output CO. TI's overview lists Σ alongside P-Q for subtraction and CPG for look-ahead carry generation.

Drawing use: Schematic
Application: Logic & signals
Reference family: IEC / Manufacturer
Form evidence: Rectangular element with Σ qualifier, P and Q inputs, CI and CO. 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

A subtracter carries the P-Q qualifier instead; Σ marks an adder.

Full reference

ADD

Symbols

Binary full adder

Adds binary input words with the documented carry-in and produces sum and carry outputs.

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

A distinction that matters

A full adder performs arithmetic; an OR gate cannot replace its sum/carry relationships.

Full reference

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