LTC4318 - Dual I2C/SMBus Address Translator

Features

  • Allows Multiple Slaves with the Same Address to Coexist on the Same Bus
  • Resistor Configurable Address Translation
  • No Software Programming Required
  • Compatible with SMBus, I2C and I2C Fast Mode
  • Pass-Through Mode Allows General Call Addressing
  • ±4kV HBM ESD Ruggedness
  • Level Translation for 2.5V, 3.3V and 5V Buses
  • Stuck Bus Timeout
  • Prevents SDA and SCL Corruption During Live Board Insertion and Removal
  • Support Bus Hot Swap™
  • 20-Lead QFN 4mm × 4mm Package

Typical Application

LTC4318 Typical Application
LTC4318 Typical Application

Description

The LTC®4318 enables the hardwired address of one or more I2C or SMBus slave devices to be translated to a different address. This allows slaves with the same hardwired address to coexist on the same bus. Only discrete resistors are needed to select the new address and no software programming is required. Up to 127 different address translations are available.

The LTC4318 incorporates a pass-through mode which disables the address translations and allows general call addressing by the master. The LTC4318 is designed to automatically recover from abnormal bus conditions like bus stuck low or premature STOP bits.

PART NUMBER NUMBER OF INPUT CHANNELS NUMBER OF OUTPUT CHANNELS
LTC4316 1 1
LTC4317 1 2
LTC4318 2 2

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC4318CUF#PBF 4x4 QFN-20 UF C 05-08-1710 Yes
LTC4318CUF#TRPBF 4x4 QFN-20 UF C 05-08-1710 Yes
LTC4318IUF#PBF 4x4 QFN-20 UF I 05-08-1710 Yes
LTC4318IUF#TRPBF 4x4 QFN-20 UF I 05-08-1710 Yes


LTC4318 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC4318CUF#PBF 4x4 QFN-20 C $2.79 $1.95 Yes
LTC4318CUF#TRPBF 4x4 QFN-20 C $2.85 $2.01 Yes
LTC4318IUF#PBF 4x4 QFN-20 I $3.20 $2.24 Yes
LTC4318IUF#TRPBF 4x4 QFN-20 I $3.26 $2.30 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • I2C, SMBus Address Expansion
  • Address Translation
  • Servers
  • Telecom

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support