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
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
For complete and up to date package information and drawings, please refer to our packaging page
MSOP-8
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC4300-1CMS8 | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300-1CMS8#PBF | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300-1CMS8#TR | MSOP | 8 | C | $1.81 | View | |
| LTC4300-1CMS8#TRPBF | MSOP | 8 | C | $1.81 | View | |
| LTC4300-1IMS8 | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300-1IMS8#PBF | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300-1IMS8#TR | MSOP | 8 | I | $2.06 | View | |
| LTC4300-1IMS8#TRPBF | MSOP | 8 | I | $2.06 | View | |
| LTC4300-2CMS8 | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300-2CMS8#PBF | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300-2CMS8#TR | MSOP | 8 | C | $1.81 | View | |
| LTC4300-2CMS8#TRPBF | MSOP | 8 | C | $1.81 | View | |
| LTC4300-2IMS8 | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300-2IMS8#PBF | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300-2IMS8#TR | MSOP | 8 | I | $2.06 | View | |
| LTC4300-2IMS8#TRPBF | MSOP | 8 | I | $2.06 | View | |
| LTC4300A-1CMS8 | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300A-1CMS8#PBF | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300A-1CMS8#TR | MSOP | 8 | C | $1.81 | View | |
| LTC4300A-1CMS8#TRPBF | MSOP | 8 | C | $1.81 | View | |
| LTC4300A-1IMS8 | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300A-1IMS8#PBF | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300A-1IMS8#TR | MSOP | 8 | I | $2.06 | View | |
| LTC4300A-1IMS8#TRPBF | MSOP | 8 | I | $2.06 | View | |
| LTC4300A-2CMS8 | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300A-2CMS8#PBF | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300A-2CMS8#TR | MSOP | 8 | C | $1.81 | View | |
| LTC4300A-2CMS8#TRPBF | MSOP | 8 | C | $1.81 | View | |
| LTC4300A-2IMS8 | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300A-2IMS8#PBF | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300A-2IMS8#TR | MSOP | 8 | I | $2.06 | View | |
| LTC4300A-2IMS8#TRPBF | MSOP | 8 | I | $2.06 | View | |
| LTC4300A-3CDD | DFN | 8 | C | $2.40 | $1.85 | View |
| LTC4300A-3CDD#PBF | DFN | 8 | C | $2.40 | $1.85 | View |
| LTC4300A-3CDD#TR | DFN | 8 | C | $1.91 | View | |
| LTC4300A-3CDD#TRPBF | DFN | 8 | C | $1.91 | View | |
| LTC4300A-3CMS8 | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300A-3CMS8#PBF | MSOP | 8 | C | $2.35 | $1.75 | View |
| LTC4300A-3CMS8#TR | MSOP | 8 | C | $1.81 | View | |
| LTC4300A-3CMS8#TRPBF | MSOP | 8 | C | $1.81 | View | |
| LTC4300A-3IDD | DFN | 8 | I | $2.85 | $2.15 | View |
| LTC4300A-3IDD#PBF | DFN | 8 | I | $2.85 | $2.15 | View |
| LTC4300A-3IDD#TR | DFN | 8 | I | $2.21 | View | |
| LTC4300A-3IDD#TRPBF | DFN | 8 | I | $2.21 | View | |
| LTC4300A-3IMS8 | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300A-3IMS8#PBF | MSOP | 8 | I | $2.70 | $2.00 | View |
| LTC4300A-3IMS8#TR | MSOP | 8 | I | $2.06 | View | |
| LTC4300A-3IMS8#TRPBF | MSOP | 8 | I | $2.06 | View | |
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Demo Boards
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Applications
- Hot Board Insertion
- Servers
- Capacitance Buffer/Bus Extender
- Desktop Computer
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LTC4300A-1
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