LTC4300-2IMS8#PBF

LTC4300-2IMS8#PBF is a LTC®4300 series hot swappable 2-wire bus buffer that allows I/O card insertion into a live backplane without corruption of the data and clock busses. When the connection is made, this device 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. This device 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 constraints on which supply voltage is higher. It is used in applications such as hot board insertion, servers, capacitance buffer/bus extender, desktop computer.

• Isolates input SDA and SCL lines from output
• READY open-drain output, 1V precharge on all SDA and SCL lines
• Supports clock stretching, arbitration and synchronization
• High impedance SDA, SCL pins for VCC = 0V
• VCC supply current is 1.8mA typical at (VSDAIN = VSCLIN = 0V, VCC1 = VCC2 = 5.5V)
• Operating frequency is 400KHz maximum at (TA = 25°C, VCC = 2.7V to 5.5V)
• Bus idle time is 95µs typical at (TA = 25°C, VCC = 2.7V to 5.5V)
• Input leakage current is ±5µA maximum at (TA = 25°C, VCC = 2.7V to 5.5V)
• Operating temperature range from -40°C to 85°C
• 8-lead plastic MSOP package

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