# Power-rail enable interface

Canonical URL: https://eloragrid.ai/symbols/power-rail-enable-interface
Publisher: Elora Grid
Updated: 2026-10-27
Lookup label: EN
Drawing use: Schematic
Reference families: Manufacturer

An enable interface requests a selected power supply or switched rail to operate.

## In plain English

### What does Power-rail enable interface mean?

An enable interface requests a selected power supply or switched rail to operate.

### A simple example

A sequencer can drive the enable input of a regulator while separately monitoring its status.

### What the drawings help you do

Draw enable as a command entering the regulator or switch, and show the resulting supply output separately. If status is returned, label that connection independently. This prevents the command to operate from being mistaken for confirmation that the power rail is healthy.

### Before using this reference

- Identify the device receiving enable.
- State the enable signal’s active condition.
- Show the separate supply output and status feedback if used.

### Is enable the same as power-good?

No. Enable requests operation; power-good reports a specified condition. A circuit can assert enable while the supply is still starting or while a fault prevents it reaching the required state.

### Terms

- Command: A request for a device to take an action.
- Power-good: An indication of the generating device’s specified acceptable-supply conditions.

Concept diagram: Controller enable command → Regulator or switch input → Requested rail operation
Original functional explanation. Arrows show information or energy roles; two-headed arrows identify two-way interfaces. This is not a pinout, certified standards graphic or complete circuit.

- [Power supply sequencing](https://www.ti.com/product-category/power-management/sequencers/overview.html)


## What it represents

An enable interface requests a selected power supply or switched rail to operate.
A sequencer can drive the enable input of a regulator while separately monitoring its status.
Draw enable as a command entering the regulator or switch, and show the resulting supply output separately. If status is returned, label that connection independently. This prevents the command to operate from being mistaken for confirmation that the power rail is healthy. This is original functional artwork, not a certified standard graphic or device pinout.

## How to read it

- Identify the device receiving enable.
- State the enable signal’s active condition.
- Show the separate supply output and status feedback if used.
- Enable is a command input; power-good is a condition output.

## Information to show or reference

- Identify the device receiving enable.
- State the enable signal’s active condition.
- Show the separate supply output and status feedback if used.

## Important distinction

Enable is a command input; power-good is a condition output.

## Facts

- Representation type: Original functional block; not a certified IEC or IEEE graphic
- Concept input: Controller enable command
- Concept output: Requested rail operation

## Public references

- [Power supply sequencing](https://www.ti.com/product-category/power-management/sequencers/overview.html) — Texas Instruments. Power supply sequencing: public technical context for the named function. Product and compliance details remain with the publisher.

## 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.