LTC4314CUDC Hot Swappable Four Channel I2C Bus Multiplexer QFN-20 Integrated Circuit Chip

The LTC4314CUDC is a hot swappable 1:4 two-wire bus multiplexer in a QFN-20 package that lets one upstream bus reach any combination of 4 downstream channels, each switched by its own enable pin.

Bidirectional buffering keeps the capacitance of the upstream bus isolated from the downstream channels, so adding cards does not degrade rise time on the master side.

Level translation spans 1.5 V, 1.8 V, 2.5 V, 3.3 V and 5 V busses, and a three state ACC pin selects the accelerator current and the rising threshold so the part can be matched to each link.

If data and clock are not both high at least once in 45 ms while DISCEN is high, the part flags FAULT, disconnects the input from each enabled channel and issues up to 16 clocks on the enabled downstream busses to clear the stuck bus.

This Commercial C grade device is specified from 0 to +70 degree C, is RoHS compliant and lead free, and ships with full traceability. Samples and volume pricing are available on request.

• LTC4314CUDC 1:4 multiplexer and switch for the 2-wire bus in QFN-20 package
• LTC4314 series in stock with full traceability and volume pricing
• 4 downstream channels, each with its own enable pin
• Bidirectional buffering for SDA and SCL lines
• Upstream capacitance isolated from downstream capacitance
• High noise margin with VIL at 0.3 times VCC
• Selectable rise time accelerator current and activation voltage
• Level translation across 1.5 V, 1.8 V, 2.5 V, 3.3 V and 5 V busses
• Prevents SDA and SCL corruption during live insertion
• FAULT signal flags a stuck bus low condition
• Up to 16 clocks generated on the enabled downstream busses
• Compatible with I2C, I2C fast mode and SMBus
• Plus or minus 4 kV human body model ESD ruggedness
• QFN-20 package

• Multi-card backplanes and shelves
• Telecom and server management buses
• Segmenting capacitive I2C buses
• Live insertion and removal of line cards
• Fault isolation between bus segments

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

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