DESCRIPTION
The LTC®4310 provides bidirectional I2C communications between two I2C buses whose grounds are isolated from one another. Each LTC4310 encodes I2C bus logic states into signals that are transmitted across an isolation barrier to another LTC4310. The receiving LTC4310 decodes the transmission and drives its l2C bus to the appropriate logic state. The isolation barrier can be bridged by an inexpensive Ethernet, or other transformer, to achieve communications across voltage differences reaching thousands of volts, or it can be bridged by capacitors for lower voltage isolation. The LTC4310-1 is intended for use in 100kHz I2C systems. The LTC4310-2 is intended for 400kHz I2C systems.

FEATURES
■ Bidirectional I2C Communication Between Two
   Isolated Buses
■ Full Isolation with Inexpensive Ethernet
   Transformers or Capacitors
■ Low Voltage Level Shifting
■ I2C Maximum Operating Frequency:
   100kHz for LTC4310-1
   400kHz for LTC4310-2
■ I2C Specification Compliant VOL, VIL
■ ±5kV Human Body Model ESD Protection
■ Rise Time Accelerators
■ SDA, SCL Hot-Swapping
■ Very Low Shutdown Current
■ Stuck Bus Disconnect and Recovery
■ Thermal Shutdown
■ 10-Lead MSOP and 3mm × 3mm DFN Packages

APPLICATIONS
■ Isolated I2C, SMBus and PMBus Interfaces
■ Isolated Power Supplies
■ Positive-to-Negative Rail Communications
■ Power-over-Ethernet