LTC4300A-2CMS8#PBF

LTC4300A-2 is a hot swappable 2-wire bus buffer allow I/O card insertion into a live backplane without corruption of the data and clock busses. When the connection is made, the 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. It replaces the ENABLE pin with a dedicated supply voltage pin, VCC2, for the card side, providing level shifting between 3.3V and 5V systems. Applications are hot board insertion, servers, capacitance buffer/bus extender, desktop computer.

• Bidirectional buffer for SDA and SCL lines increases fan-out
• 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)
• 1V precharge on all SDA and SCL lines
• Supports clock stretching, arbitration and synchronization
• Positive supply voltage is 2.7 to 5.5V at TA = 25°C
• Supply current is 3mA typical at VSDAIN = VSCLIN = 0V, VCC1 = VCC2 = 5.5V, TA = 25°C
• 8-lead plastic MSOP package
• 0°C to 70°C temperature range

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