Interface I2C and SMBus Bus Buffers and Accelerators

LTM2883 - SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
more options

LTC4313 - 2-Wire Bus Buffers with High Noise Margin

LTC4300A-3 - Level Shifting Hot Swappable 2-Wire Bus Buffer with Enable

Features

  • Bidirectional Buffer* for SDA and SCL Lines Increases Fanout
  • Prevents SDA and SCL Corruption During Live Board Insertion and Removal From Backplane
  • Logic Threshold ENABLE Input
  • Isolates Input SDA and SCL Lines from Output
  • Compatible with I2C, I2C Fast Mode and SMBus Standards (Up to 400kHz Operation)
  • 1V Precharge on all SDA and SCL Lines
  • Supports Clock Stretching, Arbitration and Synchronization
  • 5V to 3.3V Level Translation
  • High Impedance SDA, SCL Pins for VCC = 0V, VCC2 = 0V
  • Small 8-Lead DFN and MSOP Packages
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages

Typical Application

LTC4300A-3 Typical Application
LTC4300A-3 Typical Application

Description

The LTC®4300A-3 hot swappable 2-wire bus buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. When the connection is made, the LTC4300A-3 provides bidirectional buffering, keeping the backplane and card capacitances isolated. Rise-time accelerator circuitry allows the use of weaker DC pull-up currents while still meeting rise-time requirements. During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances.

The LTC4300A-3 provides level translation between 3.3V and 5V supplies. The backplane and card can both be powered with supplies ranging from 2.7V to 5.5V. The LTC4300A-3 also incorporates a CMOS threshold ENABLE pin which forces the part into a low current mode and isolates the card from the backplane. When driven to VCC, the ENABLE pin sets normal operation.

The LTC4300A-3 is available in the MSOP and 3mm × 3mm DFN packages.

*Patent pending.

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
LTC4300A-3CDD#PBF 3x3 DFN-8 DD C 05-08-1698 Yes
LTC4300A-3CDD#TRPBF 3x3 DFN-8 DD C 05-08-1698 Yes
LTC4300A-3CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC4300A-3CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC4300A-3IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC4300A-3IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC4300A-3IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LTC4300A-3IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes


LTC4300A-3 Package Drawing
LTC4300A-3 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
LTC4300A-3CDD#PBF 3x3 DFN-8 C $2.40 $1.85 Yes
LTC4300A-3CDD#TRPBF 3x3 DFN-8 C $1.91 Yes
LTC4300A-3CMS8#PBF MS-8 C $2.35 $1.75 Yes
LTC4300A-3CMS8#TRPBF MS-8 C $1.81 Yes
LTC4300A-3IDD#PBF 3x3 DFN-8 I $2.85 $2.15 Yes
LTC4300A-3IDD#TRPBF 3x3 DFN-8 I $2.21 Yes
LTC4300A-3IMS8#PBF MS-8 I $2.70 $2.00 Yes
LTC4300A-3IMS8#TRPBF MS-8 I $2.06 Yes
Buy Now • Request Samples
* 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

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC4300A-3IMS8#PBF MS-8 I $2.70 $2.00 Yes
LTC4300A-3IMS8#TRPBF MS-8 I $2.06 Yes
Buy Now • Request Samples
* 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.

Applications

  • Hot Board Insertion
  • Servers
  • Capacitance Buffer/Bus Extender
  • Desktop Computer

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LTC4300A-1

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