LTC4304CMS#PBF

LTC4304 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. When a connection is made, it provides bidirectional buffering, keeping the backplane and card capacitances isolated. If SDAOUT or SCLOUT is low for ≥30ms (typ), it automatically breaks the data and clock bus connection and FAULT will pull low. At this time the device automatically generates upto 16 clock pulses on SCLOUT in an attempt to free the bus. A connection will be enabled automatically when the bus becomes free. A logic low on the ACC input enables the device’s rise-time accelerators. A logic high on ACC disables the rise-time accelerators, which allows SDA and SCL bus pull-up voltages below VCC. During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. It is used in applications such as hot board insertion, servers, capacitance buffer/bus extender, RAID systems etc.

• Fault flag for stuck bus
• Recovers stuck busses with automatic clocking
• Bidirectional buffer for SDA and SCL lines increases fanout
• Prevents SDA and SCL corruption during live board insertion and removal from backplane
• Allows bus pullup voltages above and below VCC, ±15KV human body model ESD protection
• Isolates input SDA and SCL lines from output, READY open drain output
• High impedance SDA, SCL pins for VCC = 0V, ENABLE gates connection from input to output
• Positive supply voltage is 2.7V to 5.5V
• Supply current is 6mA typ at (VCC = 5.5V, VSDAIN = VSDAOUT = 0V, TA = 25°C)
• Operating temperature is 0°C to 70°C, package style is 10-lead plastic MSOP

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