LTC4310 - Hot-Swappable I2C Isolators

The LTC4310 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.

Rise time accelerators provide strong pull-up currents on SCL and SDA rising edges to meet rise time specifications for heavily loaded systems. Data and clock Hot Swap™ circuitry prevent data corruption when a card is inserted into or removed from a live bus. When a bus is stuck low for 37ms, the LTC4310 turns off its pull-down devices and generates up to sixteen clocks and a STOP bit in an attempt to free the bus. Driving EN low sets the LTC4310 in a very low current shutdown mode to conserve power.

  • 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
Typical Application
LTC4310 Typical Application
LTC4310 Typical Application
  • Isolated I2C, SMBus and PMBus Interfaces
  • Isolated Power Supplies
  • Positive-to-Negative Rail Communications
  • Power-over-Ethernet
LTC4310 Package Drawing
LTC4310 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4310CDD-1#PBF3x3 DFN-10C$2.11$1.48
LTC4310CDD-1#TRPBF3x3 DFN-10C$1.54
LTC4310CDD-2#PBF3x3 DFN-10C$2.11$1.48
LTC4310CDD-2#TRPBF3x3 DFN-10C$1.54
LTC4310IDD-1#PBF3x3 DFN-10I$2.54$1.78
LTC4310IDD-1#TRPBF3x3 DFN-10I$1.84
LTC4310IDD-2#PBF3x3 DFN-10I$2.54$1.78
LTC4310IDD-2#TRPBF3x3 DFN-10I$1.84
Demo Boards
Part NumberDescriptionPrice
DC1079A-ALTC4310-1 (100kHz) I2C Isolator$50.00
DC1079A-BLTC4310-2 (400kHz) I2C Isolator$50.00
Reliability Data
Product Selector Card
Press Release
CAD Symbol
Related Products
LTC4310-1/LTC4310-2 - Hot-Swappable I2C Isolators
可热插拔的 I2C 隔离器在具有隔离接地的总线之间实现了简单的连接
R527 Reliability Data
Hot-Swappable I2C Isolator
I2C Muxes, Address Translators, Buffers & Accelerators
I2C Quick Guide
Hot Swappable I2C Isolator Enables Simple Interfacing Between Busses with Isolated Grounds
LTC4310 Footprints and Symbols