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LTC4300A-1/LTC4300A-2: Hot Swappable 2-Wire Bus Buffers Data Sheet7/31/2012PDF182K
Overview
Features and Benefits
- 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 Pinsfor VCC = 0V
Product Details
The LTC4300A 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.
Applications
- Hot Board Insertion
- Servers
- Capacitance Buffer/Bus Extender
- Desktop Computer
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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R421 Reliability Data3/23/2018PDF66 K
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DN394 - Pass HDMI Compliance Tests with Ease8/22/2007PDF70K
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Serial Bus Buffers, Extenders, and Accelerators7/13/2017PDF823 K
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Digital Isolation and Interface Technology Selection Guide2/7/2020PDF4 M
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Models for the following parts are available in LTspice:
LTC4300A-1
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| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC4300A-2CMS8#PBF | Material Declaration | Reliability Data | 8-Lead MSOP | |
| LTC4300A-2CMS8#TRPBF | Material Declaration | Reliability Data | 8-Lead MSOP | |
| LTC4300A-2IMS8#PBF | Material Declaration | Reliability Data | 8-Lead MSOP | |
| LTC4300A-2IMS8#TRPBF | Material Declaration | Reliability Data | 8-Lead MSOP | |
| Wafer Fabrication Data | R421 Reliability Data |
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LTC4300A-2 Discussions
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