Optically Isolated I2C Bus Repeater
INTEGRATED CIRCUITS DIVISION
CPC5903
Optically Isolated I2C Bus Repeater
Features
• Bidirectionally Buffers I2C SDA Si...
Description
INTEGRATED CIRCUITS DIVISION
CPC5903
Optically Isolated I2C Bus Repeater
Features
Bidirectionally Buffers I2C SDA Signal Extends and Isolates I2C Interfaces Standard-mode and Fast-mode I2C
Side B Fast-mode Compatible VDDB > 4.5V Operates on 2.7V to 5.5V Voltage Level Translation Slew-Limited Drivers Reduce EMI Powerdown to Hi-Z Does Not Load I2C 3750Vrms Galvanic Isolation Single 8-pin Surface-Mount Package Flammability Rating UL 95 V-0
Applications
Isolated Control and Signal Monitoring Power-over-Ethernet Power Supply High Side Interface I2C Bus Length Extenders I2C Logic Level Translation
Approvals
UL 1577 File E76270 CSA Certified Component: Certificate 70157867 EN/IEC 60950 Certified Component:
TUV Certificate available on our website
Description
The CPC5903 is a dual, optically isolated, logic-bus repeater. It isolates two open-drain logic signals while providing 3750Vrms of galvanic isolation. When the two sides are powered by different supply voltages, it also functions as a logic level translator for levels as low as 2.7V or as high as 5.5V. Because the CPC5903 provides an isolated bidirectional buffer for the I2C data signal and a unidirectional buffer for the I2C clock signal, it is best suited for applications where clock stretching is not required. This configuration also requires the I2C bus master to be on the Side A bus.
Unlike transformer or capacitive isolators, optical isolation passes DC signals and does not require c...
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