XOR
Exclusive-OR gate
For two positive-logic inputs, produces a true output when the input states differ.
Schematic
Symbols · XNOR
Exclusive-NOR gate
For two positive-logic inputs, produces a true output when the input states are equal.
Schematic · XNOR
What it represents
For two positive-logic inputs, produces a true output when the input states are equal.
On a schematic, identify the compared input signals and the output driver type and trace the equality output and any required external pull-up. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
XNOR specifies a logical function; an open-drain implementation is a separate electrical output characteristic.
Terminal letters describe electrical roles, not package pin numbers. Check the selected public datasheet for the actual pin assignment, polarity and any internally connected terminals before completing the drawing.
How to read it
- Identify the compared input signals and the output driver type.
- Trace the equality output and any required external pull-up.
Information to show or reference
- Label the compared input signals and the output driver type.
- Cross-reference the equality output and any required external pull-up.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
XNOR specifies a logical function; an open-drain implementation is a separate electrical output characteristic.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SN74HC266 — XNOR gate logic
Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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