LTC4301 - Supply Independent Hot Swappable 2-Wire Bus Buffer
Features
- Allows Bus Pull-Up Voltages Above or Below VCC
- 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 Line from Output
- 10kV Human Body Model ESD Protection
- 1V Precharge On All SDA and SCL Lines
- Supports Clock Stretching, Arbitration and Synchronization
- High Impedance SDA, SCL Pins for VCC = 0V
- CS Gates Connection from Input to Output
- Compatible with I²C™, I²C Fast Mode and SMBus Standards (Up to 400kHz Operation)
- Small 8-Pin MSOP and DFN (3mm × 3mm) Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC4301 supply independent, hot swappable, 2-wire bus buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. In addition, the LTC4301 allows the VCC, SDAIN and SCLIN pullup voltage and the SDAOUT and SCLOUT pull-up voltage to be independent from each other. Control circuitry prevents the backplane from being connected to the card until a stop bit or a bus idle is present. When the connection is made, the LTC4301 provides bidirectional buffering, keeping the backplane and card capacitances isolated.
During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. When driven low, the CS input pin allows the part to connect after a stop bit or bus idle occurs. Driving CS high breaks the connection between SCLIN and SCLOUT and between SDAIN and SDAOUT. The READY output pin indicates that the backplane and card sides are connected together.
The LTC4301 is offered in 8-pin DFN (3mm × 3mm) and MSOP packages.
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 |
|---|---|---|---|---|---|
| LTC4301CDD#PBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LTC4301CDD#TRPBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LTC4301CMS8#PBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC4301CMS8#TRPBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC4301IDD#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC4301IDD#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC4301IMS8#PBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LTC4301IMS8#TRPBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC4301CDD#PBF | 3x3 DFN-8 | C | $2.55 | $2.05 | Yes | |
| LTC4301CDD#TRPBF | 3x3 DFN-8 | C | $2.11 | Yes | ||
| LTC4301CMS8#PBF | MS-8 | C | $2.40 | $1.95 | Yes | |
| LTC4301CMS8#TRPBF | MS-8 | C | $2.01 | Yes | ||
| LTC4301IDD#PBF | 3x3 DFN-8 | I | $2.85 | $2.35 | Yes | |
| LTC4301IDD#TRPBF | 3x3 DFN-8 | I | $2.41 | Yes | ||
| LTC4301IMS8#PBF | MS-8 | I | $2.75 | $2.25 | Yes | |
| LTC4301IMS8#TRPBF | MS-8 | I | $2.31 | Yes | ||
| Buy Now • Request Samples | ||||||
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 | |
|---|---|---|---|---|---|---|
| LTC4301IDD#PBF | 3x3 DFN-8 | I | $2.85 | $2.35 | Yes | |
| LTC4301IDD#TRPBF | 3x3 DFN-8 | I | $2.41 | Yes | ||
| LTC4301IMS8#PBF | MS-8 | I | $2.75 | $2.25 | Yes | |
| LTC4301IMS8#TRPBF | MS-8 | I | $2.31 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Hot Board Insertion
- Servers
- Capacitance Buffer/Bus Extender
- Desktop Computers
- CompactPCI™ and ATCA Systems
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- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
