LTC4303IDD DFN-8 I2C SMBus Buffer with 30ms Disconnect and Automatic Clocking IC Chip

The LTC4303IDD is a hot swappable 2-wire bus buffer in a DFN-8 package that lets an I/O card be inserted into or removed from a live backplane without disturbing the data and clock busses.

Bidirectional buffering keeps the backplane capacitance isolated from the card capacitance, so adding boards does not erode the rise time seen by the master, and the rise time accelerator permits larger pull-up resistors.

ENABLE gates the input to output connection, all SDA and SCL lines are precharged to 1 V during insertion, and the pins go high impedance when VCC is zero so an unpowered card is invisible to the bus.

If SDAOUT or SCLOUT stay low for 30 ms, the connection is broken automatically and up to 16 clock pulses are generated on SCLOUT to free the bus, after which the link is restored once the bus is idle.

The LTC4303IDD is pin compatible with the LTC4300A-1, works up to 400 kHz, survives plus or minus 15 kV HBM ESD, is specified from -40 to +85 degree C and ships with full traceability. Samples and volume pricing are available on request.

• LTC4303IDD automatic disconnect when the bus is stuck low for 30 ms in DFN-8 package
• LTC4303 series in stock with full traceability and volume pricing
• Recovers a stuck bus with automatic clocking
• Bidirectional buffering for SDA and SCL increases fan-out
• Pin compatible with the LTC4300A-1
• Prevents SDA and SCL corruption during live board insertion
• Rise time accelerator allows larger pull-up resistors
• Isolates input SDA and SCL lines from the output side
• READY open-drain output reports connection status
• ENABLE gates the connection from input to output
• 1 V precharge on all SDA and SCL lines
• High impedance SDA and SCL pins when VCC is zero
• Operation up to 400 kHz on I2C fast mode
• Plus or minus 15 kV human body model ESD protection
• DFN-8 package

• Live insertion of I/O cards
• Server and storage backplanes
• Telecom line card shelves
• Isolating capacitive bus segments
• Industrial control racks

Typical use is digitally controlled resistance and divider trimming in surface mount assemblies.

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