LTC4308CMS8#PBF

LTC4308 is a hot swappable, 2-wire bus buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. It provides bidirectional buffering, keeping the backplane and card capacitances isolated. Negative offset from output to input allows communication between output bus devices with high VOL and devices on the low voltage input side, where bus supplies can be as low as 0.9V. If SDAOUT or SCLOUT are low for 30ms, it will automatically break the Input-Output connection. At this time the device automatically generates upto 16 clock pulses on SCLOUT in an attempt to free the bus. A connection will resume if the stuck bus is cleared. During insertion, the SDAOUT and SCLOUT lines are precharged to 1V to minimize bus disturbances. When driven high, the Enable input allows the device to connect after a stop bit or bus idle condition. It is used in application like live board insertion, servers, capacitance buffer/bus extender, RAID systems, ATCA.

• Bidirectional buffer with stuck bus recovery
• Output to input offset voltage is -200mV typ at (2.7K to VCC on SDAIN)
• Compatible with non-compliant VOL I²C devices
• Prevents SDA and SCL corruption during live board insertion and removal from backplane
• ±6KV human body model (HBM) ESD protection
• Isolates input SDA and SCL lines from output
• Compatible with I²C™, I²C fast mode and SMBus
• READY open-drain output, shutdown supply current is 900μA typ at (VCC = 5.5V, ENABLE = 0V)
• Supply current is 7mA typ at (VCC = 5.5V, VSCLOUT = VSDAOUT = 0V)
• Operating temperature is 0°C to 70°C, package style is 8-lead plastic MSOP

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