# Priority encoder

Canonical URL: https://eloragrid.ai/symbols/priority-encoder
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: ENC-PRI
Drawing use: Schematic
Reference families: Manufacturer

Encodes the highest-priority qualifying input into the specified binary output word.

## 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.

## Important distinction

A priority encoder resolves simultaneous inputs using its specified order; a basic encoder does not necessarily resolve them.

## Facts

- Common schematic mnemonic: ENC-PRI — descriptive only; project/device documentation defines reference designations.
- Terminal / interface focus: The input active levels, priority order and enable controls
- Artwork scope: Original educational functional/circuit reference; not a selected product pinout.

## Public references

- [SN74HC148 — priority encoding](https://www.ti.com/lit/ds/symlink/sn74hc148.pdf) — Texas Instruments. Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.