# I2C bus buffer

Canonical URL: https://eloragrid.ai/symbols/i2c-bus-buffer
Publisher: Elora Grid
Updated: 2026-10-27
Lookup label: I2C BUF
Drawing use: Schematic
Reference families: Manufacturer

An I2C bus buffer separates or supports selected parts of an I2C connection.

## In plain English

### What does I2C bus buffer mean?

An I2C bus buffer separates or supports selected parts of an I2C connection.

### A simple example

A design can use a suitable buffer to manage loading between bus segments.

### What the drawings help you do

Show the bus segment on each side of the buffer and identify the clock and data paths. Buffers can manage electrical loading, but their permitted direction behaviour and connections vary. They should not be drawn as ordinary logic buffers without checking how they handle the selected I2C bus.

### Before using this reference

- Identify clock and data on both segments.
- Reference pull-up and loading requirements for each side.
- Check the selected buffer’s permitted bus arrangement.

### Does a buffer provide electrical isolation?

Not merely because it separates bus segments electrically for loading purposes. A rated isolation barrier is a different function and must be explicitly identified in the selected device.

### Terms

- Bus segment: A defined section of the shared clock and data connection.
- Pull-up: A component arrangement that brings an undriven signal towards its selected supply.

Concept diagram: First I2C bus segment → Selected I2C buffer → Second I2C bus segment
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.

- [I2C, I3C and SPI interface functions](https://www.ti.com/product-category/interface/i2c-i3c-ics/overview.html)


## What it represents

An I2C bus buffer separates or supports selected parts of an I2C connection.
A design can use a suitable buffer to manage loading between bus segments.
Show the bus segment on each side of the buffer and identify the clock and data paths. Buffers can manage electrical loading, but their permitted direction behaviour and connections vary. They should not be drawn as ordinary logic buffers without checking how they handle the selected I2C bus. This is original functional artwork, not a certified standard graphic or device pinout.

## How to read it

- Identify clock and data on both segments.
- Reference pull-up and loading requirements for each side.
- Check the selected buffer’s permitted bus arrangement.
- Buffer behaviour, direction handling and supported bus conditions depend on the selected device.

## Information to show or reference

- Identify clock and data on both segments.
- Reference pull-up and loading requirements for each side.
- Check the selected buffer’s permitted bus arrangement.

## Important distinction

Buffer behaviour, direction handling and supported bus conditions depend on the selected device.

## Facts

- Representation type: Original functional block; not a certified IEC or IEEE graphic
- Concept input: First I2C bus segment
- Concept output: Second I2C bus segment

## Public references

- [I2C, I3C and SPI interface functions](https://www.ti.com/product-category/interface/i2c-i3c-ics/overview.html) — Texas Instruments. I2C, I3C and SPI interface functions: 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.