LTC4303 - Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery
Features
- Automatic Disconnect of SDA/SCL Lines when Bus is Stuck Low for ≥ 30ms
- Recovers Stuck Busses with Automatic Clocking*
- Bidirectional Buffer* for SDA and SCL Lines Increases Fanout
- Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane
- Pin Compatible with LTC4300A-1
- ±15kV Human Body Model ESD Protection
- Isolates Input SDA and SCL Lines from Output
- Compatible with I2CTM, I2C Fast-Mode and SMBus Standards (Up to 400kHz Operation)
- READY Open Drain Output
- 1V Precharge on All SDA and SCL Lines
- High Impedance SDA, SCL Pins for VCC = 0V
- ENABLE Gates Connection from Input to Output
- MSOP 8-Pin and DFN (3mm × 3mm) Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC4303 hot swappable 2-wire Bus Buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. When a connection is made, the LTC4303 provides bidirectional buffering, keeping the backplane and card capacitances isolated. If SDAOUT or SCLOUT is low for ≥ 30ms (typ), the LTC4303 automatically breaks the data and clock bus connection. At this time the LTC4303 automatically generates up to 16 clock pulses on SCLOUT in an attempt to free the bus. A connection will be enabled automatically when the bus becomes free.Rise-time accelerator circuitry allows the use of larger pull-up resistors while still meeting rise-time requirements. During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. When driven high, ENABLE allows the LTC4303 to connect after a stop bit or bus idle occurs. Driving ENABLE low breaks the connection between SDAIN and SDAOUT, SCLIN and SCLOUT. READY is an open drain output that indicates when the backplane and card sides are connected together.
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 |
|---|---|---|---|---|---|
| LTC4303CDD#PBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LTC4303CDD#TRPBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LTC4303CMS8#PBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC4303CMS8#TRPBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC4303IDD#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC4303IDD#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC4303IMS8#PBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LTC4303IMS8#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 | |
|---|---|---|---|---|---|---|
| LTC4303CDD#PBF | 3x3 DFN-8 | C | $3.07 | $2.15 | Yes | |
| LTC4303CDD#TRPBF | 3x3 DFN-8 | C | $2.21 | Yes | ||
| LTC4303CMS8#PBF | MS-8 | C | $3.00 | $2.10 | Yes | |
| LTC4303CMS8#TRPBF | MS-8 | C | $2.16 | Yes | ||
| LTC4303IDD#PBF | 3x3 DFN-8 | I | $3.70 | $2.58 | Yes | |
| LTC4303IDD#TRPBF | 3x3 DFN-8 | I | $2.64 | Yes | ||
| LTC4303IMS8#PBF | MS-8 | I | $3.61 | $2.52 | Yes | |
| LTC4303IMS8#TRPBF | MS-8 | I | $2.58 | 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 | |
|---|---|---|---|---|---|---|
| LTC4303IMS8#PBF | MS-8 | I | $3.61 | $2.52 | Yes | |
| LTC4303IMS8#TRPBF | MS-8 | I | $2.58 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Hot Board Insertion
- Servers
- Capacitance Buffer/Bus Extender
- RAID Systems
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- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
