LTC4305 Series
2-Channel, 2-Wire Bus Multiplexer with Capacitance Buffering
Manufacturer: Analog Devices
Catalog
2-Channel, 2-Wire Bus Multiplexer with Capacitance Buffering
Key Features
• 1:2 2-Wire Multiplexer/Switch
• Connect SDA and SCL Lines with 2-Wire BusCommands
• Supply Independent Bidirectional Buffer for SDAand SCL Lines Increases Fan-Out
• Programmable Disconnect from Stuck Bus
• Compatible with I2C and SMBus Standards
• Rise Time Accelerator Circuitry
• SMBus Compatible ALERT Response Protocol
• Prevents SDA and SCL Corruption During Live BoardInsertion and Removal from Backplane
• ±10kV Human Body Model ESD Ruggedness
• 16-Lead (4mm × 5mm) DFN and SSOP Packages
Description
AI
The LTC4305 is a 2-channel, 2-wire bus multiplexer with bus buffers to provide capacitive isolation between the upstream bus and downstream buses. Through software control, the LTC4305 connects the upstream 2-wire bus to any desired combination of downstream channels. Each channel can be pulled up to a supply voltage ranging from 2.2V to 5.5V, independent of the LTC4305 supply voltage. The downstream channels are also provided with anALERT1-ALERT2inputs for fault reporting.Programmable timeout circuitry disconnects the downstream buses if the bus is stuck low. When activated, rise time accelerators source currents into the 2-wire bus pins to reduce rise time. Driving the ENABLE pin low restores all features to their default states. Three address pins provide 27 distinct addresses.The LTC4305 is available in 16-lead (4mm × 5mm) DFN and SSOP packages.ApplicationsNested Addressing5V/3.3V Level TranslatorCapacitance Buffer/Bus Extender