LTC4300-1 Datasheet | Linear Technology

Features n Bidirectional Buffer for SDA and SCL Lines Increases Fanout n Prevents SDA and SCL Corruption During Live Board Insertion and Removal From Backplane n Isolates Input SDA and SCL Lines From Output n patible with I2C, I2C Fast Mode and SMBus Standards (Up to 400k Hz Operation) n Low ICC Chip Disable: <1µA (LTC4300-1) n READY Open-Drain Output (LTC4300-1) n 1V Precharge on All SDA and SCL Lines n Supports Clock Stretching, Arbitration and Synchronization n 5V to 3.3V Level Translation (LTC4300-2) n High Impedance SDA, SCL Pins for VCC = 0V n Small MSOP 8-Lead Package Applications n Hot Board Insertion n Servers n Capacitance Buffer/Bus Extender n Desktop puter L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap and Thin SOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. - Protected by U.S. Patents, including 6650174. LTC4300-1/LTC4300-2 Hot Swappable 2-Wire Bus Buffers Description The LTC®4300 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 LTC4300-1/LTC4300-2 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 LTC4300‑1 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 LTC4300‑2 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...