LTC4309CGN#PBF

LTC4309CGN#PBF is a level shifting low offset hot swappable 2-wire bus buffer with stuck bus recovery. The LTC®4309 hot swappable 2-wire bus buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. The LTC4309 provides bidirectional buffering, keeping the backplane and card capacitances isolated. Low offset and high VOL tolerance allows cascading of multiple devices on the clock and data busses. If SDAOUT or SCLOUT are low for 30ms, active low FAULT will pull low indicating a stuck bus low condition. If DISCEN is tied high, the LTC4309 will automatically break the bus connection and generate up to 16 clock pulses and a stop bit in an attempt to free the bus. A connection will resume if the stuck bus is cleared. If DISCEN is connected to GND, the busses will remain connected with no clock or stop bit generation. Application includes live board insertion, servers, capacitance buffer/bus extender, RAID systems, ATCA.

• Bidirectional buffer increases fanout, 60mV buffer offset independent of load
• Optional disconnect when bus is stuck low
• Prevents SDA and SCL corruption during live board insertion and removal from backplane
• Level shift 2.5V, 3.3V and 5V busses, compatible with non-compliant VOL I²C devices
• Isolates input SDA and SCL lines from output, ±6kV human body model ESD ruggedness
• Compatible with I²C™, I²C fast-mode and SMBus
• READY open drain output, active low FAULT open drain output
• 1V recharge on all SDA and SCL lines, optional rise time accelerators
• High impedance SDA, SCL pins for VCC = 0
• 16 lead plastic SSOP package, temperature range from 0°C to 70°C

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