LTC4300A-1 - Hot Swappable 2-Wire Bus Buffers

Features

  • Bidirectional Buffer for SDA and SCL Lines Increases Fanout
  • Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane
  • Isolates Input SDA and SCL Lines from Output
  • Compatible with I²C™, I²C Fast Mode and SMBus Standards
    (Up to 400kHz Operation)
  • Small MSOP 8-Pin Package
  • Low ICC Chip Disable: <1µA
    (LTC4300A-1)
  • READY Open Drain Output
    (LTC4300A-1)
  • 1V Precharge on all SDA and SCL Lines
  • Supports Clock Stretching,
    Arbitration and Synchronization
  • 5V to 3.3V Level Translation
    (LTC4300A-2)
  • High Impedance SDA, SCL Pins
    for VCC = 0V
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC4300A-1 Typical Application
LTC4300A-1 Typical Application

Description

The LTC®4300A series hot swappable 2-wire bus buffers allow I/O card insertion into a live backplane without corruption of the data and clock busses. When the connection is made, the LTC4300A-1/LTC4300A-2 provide 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-1 incorporates a CMOS threshold digital ENABLE input pin, which forces the part into a low current mode when driven to ground and sets normal operation when driven to VCC. It also includes an open drain READY output pin, which indicates that the backplane and card sides are connected together. The LTC4300A-2 replaces the ENABLE pin with a dedicated supply voltage pin, VCC2, for the card side, providing level shifting between 3.3V and 5V systems. Both the backplane and card may be powered with supply voltages ranging from 2.7V to 5.5V, with no contraints on which supply voltage is higher. The LTC4300A-2 also replaces the READY pin with a digital CMOS input pin, ACC, which enables and disables the rise-time accelerator currents.

The LTC4300A is available in a small 8-pin MSOP package.

*U.S. Patent No. 6,650,174

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-1CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC4300A-1CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC4300A-1IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LTC4300A-1IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes


LTC4300A-1 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-1CMS8#PBF MS-8 C $2.35 $1.75 Yes
LTC4300A-1CMS8#TRPBF MS-8 C $1.81 Yes
LTC4300A-1IMS8#PBF MS-8 I $2.70 $2.00 Yes
LTC4300A-1IMS8#TRPBF MS-8 I $2.06 Yes
Buy NowRequest 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

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data 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-1IMS8#PBF MS-8 I $2.70 $2.00 Yes
LTC4300A-1IMS8#TRPBF MS-8 I $2.06 Yes
Buy NowRequest 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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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LTC4300A-1

Technical Support