DEC
Binary decoder / demultiplexer
Uses binary selection and enable conditions to activate the documented selected output.
Schematic
Symbols · ENC-PRI
Priority encoder
Encodes the highest-priority qualifying input into the specified binary output word.
Schematic · ENC-PRI
What it represents
Encodes the highest-priority qualifying input into the specified binary output word.
On a schematic, identify the input active levels, priority order and enable controls and trace the encoded outputs and validity/cascade signals. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
A priority encoder resolves simultaneous inputs using its specified order; a basic encoder does not necessarily resolve them.
The preview is an independently drawn educational functional reference. Add the selected component’s actual power pins, terminal numbers, timing or analogue reference details when producing a construction drawing.
How to read it
- Identify the input active levels, priority order and enable controls.
- Trace the encoded outputs and validity/cascade signals.
Information to show or reference
- Label the input active levels, priority order and enable controls.
- Cross-reference the encoded outputs and validity/cascade signals.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
A priority encoder resolves simultaneous inputs using its specified order; a basic encoder does not necessarily resolve them.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SN74HC148 — priority encoding
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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