Overview
HCPL-4100 is listed in the Logic IC category. DigiCamel provides a local PDF for online reference.
Summary
Optically Coupled 20 mA Current Loop Transmitter
Description
The HCPL-4100 optocoupler is designed to operate as a transmitter in equipment using the 20 mA current loop. 20 mA current loop systems conventionally signal a logic high state by transmitting 20 mA of loop current (MARK), and signal a logic low state by allowing no more than a few milliamperes of loop current (SPACE). Optical coupling of the signal from the logic input to the 20 mA current loop breaks ground loops and provides very high immunity to common mode interference.
Source title
HCPL-4100 Datasheet(PDF) - AVAGO TECHNOLOGIES LIMITED